From the gum-resin of Ailanthus grandis six pregnane, two cholestane,
two hopane, one lupane and one gammacerane derivatives have been isola
ted. One, 3-alpha-acetyloxy-5-alpha-pregnan-16-one, is a new compound.
Four, 20S-acetyloxy-4-pregnene-3,16-dione, 16-beta-acetyloxy-pregn-4,
17(20)-trans-dien-3-one, gammacerane-3,21-dione and ha-acetyloxy-5-alp
ha-pregn-17(20)-(cis)-en-16-one, are new natural products. Their struc
tures were established by UV, IR, MS, H-1 and C-13 NMR spectroscopy an
d two-dimensional NMR techniques (COSY, HMQC and HMBC).