Further acidic constituents and neutral components of pinus massoniana Resin

The resin of Pinus massoniana Lamb. contains, in addition to those isolated in an earlier study, two new diterpene acids, viz. 15-hydroxy-7,13-abietadien-12-on-18-oic acid and 8(14)-podocarpen-7,13-dion-18-oic acid, and three new plant products, viz. 2β-hydroxy-8,11,13-abietatrien-18-oic acid, 7,13,15-abietatrien-18-oic acid, and 13-hdyroxy-8,11,13-podocarpatrien-18-oic acid. The above acids and four others from the resin were isolated as the p-nitrophenyl esters, and the structures of these were established from spectroscopic evidence. Also isolated were three neutral di- and sesquiterpenes.