| 主权项 |
1. A compound of formula (I): wherein: R1 is, independently, hydrogen, an optionally substituted C1-20 aliphatic group, or an optionally substituted C1-20 heteroaliphatic group; R2 is, independently, an optionally substituted C1-20 aliphatic group or an optionally substituted C1-20 heteroaliphatic group; RA is hydrogen, an optionally substituted C1-20 aliphatic group, an optionally substituted, C1-20 heteroaliphatic group, or a group of formula (II): whereinR3 is, independently, hydrogen, an optionally substituted C1-20 aliphatic group, or an optionally substituted C1-20 heteroaliphatic group; andR4 is, independently, an optionally substituted C1-20 aliphatic group or an optionally substituted C1-20 heteroaliphatic group; RB is an optionally substituted aryl group, an optionally substituted heteroaryl group, or a group of formula (II): wherein R3 and R4 are as defined above; and wherein any one or more of R1, R2, R3, and R4 together with another R1, R2, R3, or R4 or one of RA and RB optionally defines a carbocyclic or heterocyclic ring system; and RA and RB together optionally define a carbocyclic or heterocyclic ring system. |
