a pyrimidine ribonucleoside + H2O <=> a pyrimidine nucleobase + D-ribose
a pyrimidine ribonucleoside + h2o <=> a pyrimidine nucleobase + d-ribose
a pyrimidine ribonucleoside + H2O <=> a pyrimidine nucleobase + D-ribose
a pyrimidine ribonucleoside + h2o <=> a pyrimidine nucleobase + d-ribose