estrane 0 246.235 246.43080 Beilstein:3125721 C18H30 CHEBI:23966 GRXPVLPQNMUNNX-MHJRRCNVSA-N InChI=1S/C18H30/c1-18-11-4-7-17(18)16-9-8-13-5-2-3-6-14(13)15(16)10-12-18/h13-17H,2-12H2,1H3/t13?,14-,15+,16+,17-,18-/m0/s1 LIPID_MAPS_instance:LMST02010000 Oestran [H][C@]12CCCCC1CC[C@]1([H])[C@]2([H])CC[C@]2(C)CCC[C@@]12[H] chebi_ontology estrane oestrane steroid fundamental parent