chemical structure of thymine, one of the four main nucleobases, simple black icon

acid atom atomic atoms background base carbon chemical chemistry composition compound deoxyribonucleic deoxythymidine dimer dna drawing flat formula hydrogen icon illustration isolated kink line logo methyluracil model molecular molecule mutation nitrogen nucleic nucleobase oxygen pyrimidine red science skeletal structural structure thy thymidine thymin thymine thymus tymine ultraviolet vector