label: (1S,2R)-1-C-(indol-3-yl)glycerol 3-phosphate + L-serine = D-glyceraldehyde 3-phosphate + L-tryptophan + H2O
label_lc: (1s,2r)-1-c-(indol-3-yl)glycerol 3-phosphate + l-serine = d-glyceraldehyde 3-phosphate + l-tryptophan + h2o