Afterwards, hydroxymethylbilane is converted to Uroporphyrinogen III and catalyzed to coproporphrinogen III, via uroporphyrinogen III co-synphase and uroporphyrinogen decarboxylase respectively.

之后，羟甲基胆色烷转化为尿卟啉原III，并分别通过尿卟啉原Ⅲ共合酶与尿卟啉原脱羧酶催化形成粪卟啉原Ⅲ。

Afterwards, hydroxymethylbilane is converted to uroporphyrinogen III and catalyzed to coproporphyrinogen III via uroporphyrinogen III cosynthase and uroporphyrinogen decarboxylase, respectively.

之后，羟甲基胆素通过尿卟啉原III协同合成酶转化为尿卟啉原III，再由尿卟啉原脱羧酶催化为粪卟啉原III。