New lanostanoid glycosides from the fruit body of Laetiporus versisporus

Four new lanostanoid glycosides, 3 beta,7 alpha-dihydroxy-24-methylene-lano st-8-en-21-oic acid 7-O-beta-D-glucopyranoside (1), 3 beta,7 alpha-dihydrox y-lanost-8,24-dien-21-oic acid 7-O-beta-D-glucopyranoside (2), 7 alpha-hydr oxy-3-keto-lanost- 8,24-dien-21-oic acid 7-O-beta-D-glucopyranoside (3), an d 7 alpha-hydroxy-3-keto-24-methylene-lanost-8-en-21-oic acid 7-O-beta-D-gl ucopyranoside (4) were isolated from the fruit bodies of Laetiporus versisp orus. Compounds 1-4 were named laetiposides A-D, respectively. Their struct ures were established by extensive NMR experiments and chemical methods.