preferred_name: [molybdopterin-synthase sulfur-carrier protein]-C-terminal Gly-Gly-AMP + S-sulfanyl-L-cysteinyl-[cysteine desulfurase] + AH2 = [molybdopterin-synthase sulfur-carrier protein]-C-terminal Gly-NH-CH2-C(O)SH + L-cysteinyl-[cysteine desulfurase] + A + AMP + H(+)