3-Carboxy-2-(6-hydroxy-2,5,5,8a-tetramethyl-1,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-ylmethoxy)-pentanedioic acid InChI=1/C21H32O8/c1-11-5-6-14-20(2,3)15(22)7-8-21(14,4)13(11)10-29-17(19(27)28)12(18(25)26)9-16(23)24/h5,12-15,17,22H,6-10H2,1-4H3,(H,23,24)(H,25,26)(H,27,28)/t12-,13-,14-,15-,17+,21+/m0/s Isocryptoporic acid I L-threo-pentaric acid, 3-carboxy-2,3-dideoxy-4-O-[[(1S,4aR,6S,8aS)-1,4,4a,5,6,7,8,8a-octahydro-6-hydroxy-2,5,5,8a-tetramethyl-1-naphthalenyl]methyl]- rel-3-carboxy-2,3-dideoxy-4-O-{[(1R,4aS,6R,8aR)-6-hydroxy-2,5,5,8a-tetramethyl-1,4,4a,5,6,7,8,8a-octahydronaphthalen-1-yl]methyl}-D-threo-pentaric acid