(.alpha.-Ethylcrotonyl)carbamide (.alpha.-Ethylcrotonyl)urea (2-Ethylcrotonoyl)urea 2-Butenamide, N-(aminocarbonyl)-2-ethyl- 5982-97-8 Crotonyl ureide, .alpha.-ethyl- NSC163913 Urea, (.alpha.-ethylcrotonoyl)- Urea, (2-ethylcrotonoyl)- WLN: ZVMVY2&U2