5-methyluridine ribothymidine - pyrimidine nucleoside molecule

acid atom atomic base biochemistry block bond carbon chemical chemistry code component compound dna education formula genetic glycosidic helix hydrogen illustration methyluridine molecular molecule nitrogen nitrogenous nucleic nucleoside nucleotide organic oxygen powder pyrimidine ribofuranose ribonucleic ribonucleoside ribose ribothymidine rna science structural structure study thymine vector