4-甲基-1,2,4-三吖戊啶-3,5-二酮

4-氨基-(4H)-1,2,4-噻唑-3,5-二醇

4-hexyl-1,2,4-triazolidine-3,5-dione

1-苯基尿唑

1,3-bis(4-butylphenyl)urea