Dimethylthymine dimer

cis-syn-Tetramethylthymine dimer

1,3-Dimethylthymine cis-syn-dimer

1,3-dimethylthymine cyclobutane dimer

1,4a,4b,8,8aα,8bα-Hexahydro-1,3,4aα,4bα,6,8-hexamethylcyclobuta[1,2-d:4,3-d']dipyrimidine-2,4,5,7-tetrone

1,3,4aβ,4bβ,6,8-Hexamethyl-1,4a,4b,8,8aβ,8bβ-hexahydrocyclobuta[1,2-d:4,3-d']dipyrimidine-2,4,5,7(3H,6H)-tetrone