Salicylic acid derivatives and phenylspirodrimanes from the sponge-associated fungus Hansfordia sinuosae.

Three new salicylic acid derivatives (1-3) and a known one, 6-(3'-hydroxypropyl)-2-hydroxybenzoic acid (4), together with seven known phenylspirodrimanes (5-11), were isolated from the sponge-associated fungus Hansfordia sinuosae, collected from the South China Sea. HRESIMS, FT-IR Spectroscopy, and NMR techniques including COSY, HSQC, and HMBC were used to elucidate the structures of these compounds. The inhibitory effects of the isolated compounds (1-11) against HIV-1 virus were evaluated, and most of the phenylspirodrimanes (5, 8-11) showed varying degrees of anti-HIV activity.