1-(4-Methoxy-phenyl)-9,9-dimethyl-7a,10a-dihydro-7H-8,10-dioxa-cyclopenta[a]phenalen-7-ol 7H-phenaleno[1,2-d][1,3]dioxol-7-ol, 7a,10a-dihydro-1-(4-methoxyphenyl)-9,9-dimethyl-, (7R,7aS,10aR)- InChI=1/C23H22O4/c1-23(2)26-21-19-16(13-7-10-15(25-3)11-8-13)12-9-14-5-4-6-17(18(14)19)20(24)22(21)27-23/h4-12,20-22,24H,1-3H3/t20-,21-,22+/m1/s rel-(7R,7aS,10aR)-1-(4-methoxyphenyl)-9,9-dimethyl-7a,10a-dihydro-7H-phenaleno[1,2-d][1,3]dioxol-7-ol