Anthelmintic macrolactams from Nonomuraea turkmeniaca MA7364

Two new macrolactams, 6-desmethyl-N-methylfluvirucin A(1) (1) and N-methylfluvirucin A(1) (2), have been isolated from the acetone extract of Nonomuraea turkmeniaca MA7364. These compounds were isolated by bioassay-guided fractionation as part of our search for new anthelmintics. The structures of these compounds were elucidated by comparison of their NMR and MS data to those of previously reported fluvirucins and confirmed by 2D NMR. Compound 1 exhibited in vitro activity (EC90 15 +/- 5 mu g/mL) against Haemonchus contortus larvae, whereas compound 2, while a bit less active in vitro (EC90 29 +/- 8 mu g/mL), showed modest in vivo activity against a surrogate organism, Heligmosomoides polygyrus in mice, at 50 mg/kg.