Longipinene derivatives from Stevia porphyrea

The new longipinene derivatives 8 alpha-angeloyloxy-7 beta- hydroxy-9 alpha -isovaleroyloxylongipin-2-en-1-one, 7 beta-angeloyloxy-8 alpha,9 alpha-dihy droxylongipin-2-en-1-one and 7 beta-angeloyloxy-9 alpha-hydroxy-8 alpha-iso valeroyloxylongipin-2-en-1- one together with five known longipinenes, frie delin and stigmasterol were isolated from the roots of Stevia porphyrea. Th e positional assignment of individual ester residues was done by HMBC exper iments. (C) 1999 Elsevier Science Ltd. All rights reserved.