(+)-Mazethramycin A methyl ether 2-Propenamide, N-methyl-3-(5,10,11,11a-tetrahydro-9-hydroxy-11-methoxy- 8-methyl-5-oxo-1H-pyrrolo[2,1-c][1,4]benzodiazepin-2-yl)- 68373-95-5 Mazethramycin B NSC326670