preferred_name: all-trans-7,8-dihydroretinol + A <=> all-trans-retinol + AH2
preferred_name_lc: all-trans-7,8-dihydroretinol + a <=> all-trans-retinol + ah2
label: all-trans-7,8-dihydroretinol + A <=> all-trans-retinol + AH2
label_lc: all-trans-7,8-dihydroretinol + a <=> all-trans-retinol + ah2