siroheme + 2 H(+) <=> 12,18-didecarboxysiroheme + 2 CO2
siroheme + 2 h(+) <=> 12,18-didecarboxysiroheme + 2 co2
siroheme + 2 H(+) <=> 12,18-didecarboxysiroheme + 2 CO2
siroheme + 2 h(+) <=> 12,18-didecarboxysiroheme + 2 co2