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Four-membered rings

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chlordecone (143-50-0)  
Kepone
Kepone, also known as chlordecone, is an organochlorine compound and a colourless solid. This compound is a controversial insecticide related to Mirex and DDT. Its use was so disastrous that it is now prohibited in the western world, but only after many millions of kilograms had been produced.
MIREX (2385-85-5)  
Mirex is an organochloride that was commercialized as an insecticide and later banned because of its impact on the environment. This white crystalline odorless solid is a derivative of cyclopentadiene. It was popularized to control fire ants but by virtue of its chemical robustness and lipophilicity it was recognized as a bioaccumulative pollutant.
ALPHA-PINENE (80-56-8, 2437-95-8, 25766-18-1, 67762-73-6, 7785-70-8)  
Wilt Pruf  ·  alpha-pinene, pinene  ·  2-pinene
α-Pinene is an organic compound of the terpene class, one of two isomers of pinene. It is an alkene and it contains a reactive four-membered ring. It is found in the oils of many species of many coniferous trees, notably the pine.
(-)-alpha-Pinene (2437-95-8, 7785-26-4)  
α-Pinene is an organic compound of the terpene class, one of two isomers of pinene. It is an alkene and it contains a reactive four-membered ring. It is found in the oils of many species of many coniferous trees, notably the pine.
beta-propiolactone (57-57-8)  
Propiolactone  ·  beta Propiolactone  ·  Propanolide
Propiolactone may refer to either of two isomeric chemical compounds: Alpha-Propiolactone (α-Propiolactone) Beta-Propiolactone (β-Propiolactone)
BETA-PINENE (127-91-3, 25719-60-2, 127-91-3, 18172-67-3)  
terebenthene  ·  terbenthene
beta-Pinene (β-pinene) is a monoterpene, an organic compound found in plants. It is one of the two isomers of pinene, the other being α-pinene. It is colorless liquid soluble in alcohol, but not water.
Diketene (674-82-8)  
Diketene is an organic compound with the molecular formula C4H4O2, and which is sometimes written as (CH2CO)2. It is formed by dimerization of ketene, H2C=C=O (IUPAC name: ethenone). Diketene is a member of the oxetane family.
butorphanol (42408-82-2, 58786-99-5)  
Stadol  ·  Butorphanol Tartrate  ·  Stadol NS
Butorphanol (BC 2627) is a morphinan-type synthetic agonist–antagonist opioid analgesic developed by Bristol-Myers. Brand name Stadol was recently discontinued by the manufacturer. It is now only available in its generic formulations, manufactured by Novex, Mylan, Apotex and Ben Venue Laboratories.
CYCLOBUTANE (287-23-0)  
Cyclobutane is a cycloalkane and organic compound with the formula (CH2)4. Cyclobutane is a colourless gas and commercially available as a liquefied gas. Derivatives of cyclobutane are called cyclobutanes.
nalbuphine (20594-83-6)  
Nubain  ·  Nalbuphine Hydrochloride  ·  EN-2234A
Nalbuphine is a semi-synthetic opioid agonist-antagonist used commercially as an analgesic under a variety of trade names, including Nubain and Manfine.
FOSTHIETAN (21548-32-3)  
Fosthietan (chemical formula:C 6H 12NO 3PS 2) is a chemical compound used in insecticides and nematicides.
Oxetane (503-30-0)  
trimethylene oxide
Oxetane, or 1,3-propylene oxide, is an heterocyclic organic compound with the molecular formula C 3H 6O, having a four-membered ring with three carbon atoms and one oxygen atom. The term oxetane may also refer more generally to any organic compound containing an oxetane ring.
BETA-CARYOPHYLLENE (87-44-5)  
caryophyllene  ·  caryophyllene, (S-(R*,4Z,9S*))-isomer  ·  caryophyllene, (S-(R*,4E,9S*))-isomer
Caryophyllene , or (−)-β-caryophyllene, is a natural bicyclic sesquiterpene that is a constituent of many essential oils, especially clove oil, the oil from the stems and flowers of Syzygium aromaticum (cloves), the essential oil of Cannabis sativa, rosemary, and hops. It is usually found as a mixture with isocaryophyllene (the cis double bond isomer) and α-humulene (obsolete name: α-caryophyllene), a ring-opened isomer. Caryophyllene is notable for having a cyclobutane ring, as well as a trans-double bond in an 9-membered ring, both rarities in nature.
Octafluorocyclobutane (115-25-3)  
Freon C-318  ·  Freon C 318
Octafluorocyclobutane, or perfluorocyclobutane, C4F8, is an organofluorine compound which enjoys several niche applications. It is related to cyclobutane by replacement of all C–H bonds with C–F bonds. Octafluorocyclobutane is produced by the dimerization of tetrafluoroethylene and the reductive coupling of 1,2-dichloro-1,1,2,2-tetrafluoroethane.
Isocaryophyllene (118-65-0, 87-44-5)  
caryophyllene  ·  caryophyllene, (S-(R*,4Z,9S*))-isomer  ·  caryophyllene, (S-(R*,4E,9S*))-isomer
Caryophyllene , or (−)-β-caryophyllene, is a natural bicyclic sesquiterpene that is a constituent of many essential oils, especially clove oil, the oil from the stems and flowers of Syzygium aromaticum (cloves), the essential oil of Cannabis sativa, rosemary, and hops. It is usually found as a mixture with isocaryophyllene (the cis double bond isomer) and α-humulene (obsolete name: α-caryophyllene), a ring-opened isomer. Caryophyllene is notable for having a cyclobutane ring, as well as a trans-double bond in an 9-membered ring, both rarities in nature.
2133-34-8 (2133-34-8)  
azetidyl-2-carboxylic acid
Azetidine-2-carboxylic acid (abbreviated Aze) is a plant non-protein amino acid homologue of proline with the molecular formula C4H7NO2. Aze is a heterocyclic, 4 membered ring with nitrogen as its heteroatom (an azetidine), and a carboxylic acid group substituted on one of the ring carbon atoms. The main difference between Aze and proline is the ring of Aze has four members and the ring of proline has five.
cefotetan (69712-56-7)  
Cefotan  ·  Cefotetan Disodium  ·  YM-09330
Cefotetan is an injectable antibiotic of the cephamycin type for prophylaxis and treatment of bacterial infections. It is often grouped together with second-generation cephalosporins and has a similar antibacterial spectrum, but with additional anti-anaerobe coverage. Cefotetan was developed by Yamanouchi.
Caryophyllene (13877-93-5, 87-44-5)  
caryophyllene, (S-(R*,4Z,9S*))-isomer  ·  caryophyllene, (S-(R*,4E,9S*))-isomer  ·  beta-caryophyllene
Caryophyllene , or (−)-β-caryophyllene, is a natural bicyclic sesquiterpene that is a constituent of many essential oils, especially clove oil, the oil from the stems and flowers of Syzygium aromaticum (cloves), the essential oil of Cannabis sativa, rosemary, and hops. It is usually found as a mixture with isocaryophyllene (the cis double bond isomer) and α-humulene (obsolete name: α-caryophyllene), a ring-opened isomer. Caryophyllene is notable for having a cyclobutane ring, as well as a trans-double bond in an 9-membered ring, both rarities in nature.
3,3-Bis(chloromethyl)oxetane (78-71-7, 25323-58-4)  
3,3-Bis(chloromethyl)oxetane (BCMO) is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.
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