Ethyl N-tt-Hexylthioureidomethylenecyanoacetate.-N-«-Hexylthiourea (16 g. or 0.1 mole), ethyl orthoformate (17 g. or 0.115 mole) and ethyl cyanoacetate (11.3 g. or 0.1 mole) were mixed together and heated to refluxing temperature for 30 minutes. The mixture was concentrated under reduced pressure to obtain the solid product. This was recrystallized from ethyl acetate; yield 11.5 g. or 41%, m.p.