2-(8a-Hydroxy-4a-methyl-8-methylene-decahydro-naphthalen-2-yl)-acrylic acid 2-naphthaleneacetic acid, decahydro-8a-hydroxy-4a-methyl-alpha,8-bis(methylene)-, (2R,4aR,8aS)- 5beta-Hydroxtcostic acid InChI=1/C15H22O3/c1-10-5-4-7-14(3)8-6-12(9-15(10,14)18)11(2)13(16)17/h12,18H,1-2,4-9H2,3H3,(H,16,17)/t12-,14-,15+/m1/s rel-2-[(2R,4aR,8aS)-8a-hydroxy-4a-methyl-8-methylenedecahydronaphthalen-2-yl]acrylic acid