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|Section2= |Section3= }} Cucurbitane is a chemical compound with formula (CAS number 65441-59-0). It is a polycyclic hydrocarbon, specifically a triterpene. It is an isomer of lanostane (specifically 19(10→9β)''abeo''-lanostane), from which it differs by the formal shift of a methyl group (carbon number 19) from the 10 to the 9β position in the standard steroid numbering scheme.〔IUPAC Commission on the Nomenclature of Organic Chemistry and IUPAC-IUB Commission on Biochemical Nomenclature (1969), ''The Nomenclature of Steroids — Revised Tentative Rules''. European J. of Biochemistry, volume 10, 1-19〕〔Satish Kumar and Raj Kumar (1991), ''Dictionary of Biochemistry''. Anmol Publications, India〕 The name is applied to two stereoisomers, distinguished by the prefixes 5α- and 5β, which differ by the handedness of the bonds at a particular carbon atom (number 5 in the standard steroid numbering scheme).〔 File:5alpha-cucurbitane.svg|5α-Cucurbitane File:5beta-cucurbitane.svg|5β-Cucurbitane ==Derivatives== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cucurbitane」の詳細全文を読む スポンサード リンク
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