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 Mazethramycin methyl ether