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-aminoethanethioate + L-cysteinyl-[cysteine desulfurase] + A + AMP + 2 H(+)