1-naphthalenecarboxylic acid, 5-[(2E)-3-carboxy-2-butenyl]decahydro-1,4a-dimethyl-6-methylene-, (1S,4aR,5S)- 15-nor-Labda-8(17),12E-dien-13,19-dienoic acid 5-(3-Carboxy-but-2-enyl)-1,4a-dimethyl-6-methylene-decahydro-naphthalene-1-carboxylic acid InChI=1/C19H28O4/c1-12-7-9-15-18(3,10-5-11-19(15,4)17(22)23)14(12)8-6-13(2)16(20)21/h6,14-15H,1,5,7-11H2,2-4H3,(H,20,21)(H,22,23)/b13-6+/t14-,15?,18+,19-/m0/s rel-(1R,4aS,5R)-5-[(2E)-3-carboxybut-2-en-1-yl]-1,4a-dimethyl-6-methylenedecahydronaphthalene-1-carboxylic acid