has role has functional parent is enantiomer of independent continuant thymidine CHEBI:17748 THYMIDINE A pyrimidine 2'-deoxyribonucleoside having thymine as the nucleobase. Thymidine thymine pyrimidine 2'-deoxyribonucleoside antineoplastic agent telbivudine mouse metabolite Escherichia coli metabolite human metabolite