bufanolide 358.28718 0 PXOHOSHERMSUCD-YQMMVUDVSA-N bufanolide C24H38O2 CHEBI:22934 chebi_ontology 358.55732 InChI=1S/C24H38O2/c1-23-13-4-3-5-17(23)7-8-18-20-10-9-19(16-6-11-22(25)26-15-16)24(20,2)14-12-21(18)23/h16-21H,3-15H2,1-2H3/t16-,17?,18-,19+,20+,21-,23-,24+/m0/s1 [H][C@@]1(CCC(=O)OC1)[C@@]1([H])CC[C@]2([H])[C@]3([H])CCC4CCCC[C@]4(C)[C@@]3([H])CC[C@]12C steroid lactone steroid fundamental parent