preferred_name: a pyrimidine nucleobase + D-ribose => a pyrimidine ribonucleoside + H2O
preferred_name_lc: a pyrimidine nucleobase + d-ribose => a pyrimidine ribonucleoside + h2o
label: a pyrimidine nucleobase + D-ribose => a pyrimidine ribonucleoside + H2O
label_lc: a pyrimidine nucleobase + d-ribose => a pyrimidine ribonucleoside + h2o