steroid fundamental parent pregnane 288.28170 chebi_ontology C21H36 0 LIPID_MAPS_instance:LMST02030000 InChI=1S/C21H36/c1-4-15-9-11-18-17-10-8-16-7-5-6-13-20(16,2)19(17)12-14-21(15,18)3/h15-19H,4-14H2,1-3H3/t15-,16?,17-,18-,19-,20-,21+/m0/s1 288.51054 Wikipedia:Pregnane [H][C@]1(CC)CC[C@@]2([H])[C@]3([H])CCC4([H])CCCC[C@]4(C)[C@@]3([H])CC[C@]12C pregnane CHEBI:8386 JWMFYGXQPXQEEM-WZBAXQLOSA-N