5-chloro-1,3,5-trimethyl-1,3-diazinane-2,4,6-trione

trans-5-chloro-6-hydroperoxy-1,3-dimethyl-5,6-dihydrothymine

5-chloro-6-hydroxy-1,3-dimethyl-5,6-dihydrothymine

(cis,anti)-1,3-dimethyluracyl dimer

1,3,4a,5,7,8a-hexamethyltetrahydrocyclobuta[1,2-d:3,4-d']dipyrimidine-2,4,6,8(1h,3h,4ah,7h)-tetrone