主权项 |
1. A compound of formula (II): wherein:
R1 is chosen from N, S, or O;R2 is chosen from N, S, or O;R4 is chosen from (CH2)x, ((CH2)yO)z, and ((CH2)aO(CH2)b), wherein x, y, z, a, and b are integers from 1 to 3;R5 is chosen from an aromatic ring, a cyclic ring, and a heterocyclic ring; andR6 is chosen from hydrogen, a hydrocarbyl, and a substituted hydrocarbyl. |