1.14.11.21 clavaminate synthase Clavulanic acid biosynthesis - 00331 - 2.5.1.66 N2-(2-carboxyethyl)arginine synthase Clavulanic acid biosynthesis - 00331 - 3.5.3.22 proclavaminate amidinohydrolase Clavulanic acid biosynthesis - 00331 - 6.3.3.4 (carboxyethyl)arginine beta-lactam-synthase Clavulanic acid biosynthesis - 00331 -