- H2NC3H5(COOH)2H_{2} N C_{3} H_{5}(C O O H)_{2}
- (H2N)2C3H5COOH\left(H_{2} N \right) 2 C 3 H 5 COOH
- H2NC3H6COOHH _{2} NC _{3} H _{6} COOH
- H2NC7H12COOHH _{2} NC _{7} H _{12} COOH