Two new amino acid-derived oximes from the mangrove-sediment-derived fungus Lecanicillium kalimantanense SCSIO 41702.

Two new amino acid-derived oximes N-(2-hydroxyimino-4-methyl-pentanoyl)-L-isoleucine (1) and N-(2-hydroxyimino-4-methyl-pentanoyl)-L-leucine (2), along with two known analogues (E)-N-(2-hydroxyimino-3-phenylpropanoyl)-L-phenylalanine (3) and methyl (E)-N- (2-hydroxyimino-3-phenylpropanoyl)-L-phenylalaninate (4), were isolated from the mangrove-sediment-derived fungus Lecanicillium kalimantanense SCSIO 41702. Their structures were determined by spectroscopic analysis. The absolute configurations of 1 and 2 were determined by Marfey's method. Compounds 1 and 2 showed medium inhibitory activity against LPS-induced NO production.