A &bgr;-lactam compound of the formula:
wherein R1 is lower alkyl or OH-substituted lower alkyl, R2 is H or lower alkyl, X is O, S or NH, n is 1 to 3, R3 is —C(Ra)═NH (Ra is H, lower alkyl or substituted lower alkyl), or a salt thereof, or an ester thereof. These compounds show excellent antibacterial activity against Gram-positive bacteria, particularly against methicillin-resistant Staphylococci and methicillin-resistant and coagulase-negative Staphylococci.
一种
化学式为:其中R1为较低的烷基或羟基取代的较低烷基,R2为氢或较低的烷基,X为氧、
硫或氮,n为1至3,R3为—C(Ra)═NH(Ra为氢、较低烷基或取代的较低烷基),或其盐或酯的A &bgr;-内酰胺化合物。这些化合物对革兰氏阳性菌表现出优异的抗菌活性,特别是对
甲氧西林耐药的葡萄球菌和
甲氧西林耐药和凝集阴性葡萄球菌。