“The structures of 2 new polyhydroxylated cannabinoids, (+/-)9,10-dihydroxy-delta6a(10a)-tetrahydrocannabinol and (+/-)8,9-dihydroxy-delta6a(10a)-tetrahydrocannabinol, obtained from a hexane extract of an Indian Cannabis variant were determined by spectral means and correlation with cannabinol.”

http://www.ncbi.nlm.nih.gov/pubmed/720501