part of part of has input has input has output has output process reaction precorrin-8X = hydrogenobyrinic acid 1 1 1 reaction KEGG:R05177 METACYC:5.4.1.2-RXN UPa:UCR05177 RHEA:22515 cob(II)yrinate a,c-diamide from precorrin-2 (aerobic route): step 8/10 hydrogenobyrinic acid precorrin-8X