preferred_name: (4aS,6R)-4a-hydroxy-L-erythro-5,6,7,8-tetrahydrobiopterin => (6R)-L-erythro-6,7-dihydrobiopterin + H2O
preferred_name_lc: (4as,6r)-4a-hydroxy-l-erythro-5,6,7,8-tetrahydrobiopterin => (6r)-l-erythro-6,7-dihydrobiopterin + h2o
label: (4aS,6R)-4a-hydroxy-L-erythro-5,6,7,8-tetrahydrobiopterin => (6R)-L-erythro-6,7-dihydrobiopterin + H2O
label_lc: (4as,6r)-4a-hydroxy-l-erythro-5,6,7,8-tetrahydrobiopterin => (6r)-l-erythro-6,7-dihydrobiopterin + h2o