主权项 |
1. A compound of the formula: or monosilylated derivative thereof, wherein R4, R5, or R6 are independently selected from alkyl, heteroalkyl, cycloalkyl, hydroxyalkyl, acyl, aryl, ether derivatives thereof, or a combination thereof, and R1, R2, R3, R7, R8, or R9 are independently selected from alkyl, heteroalkyl, cycloalkyl, hydroxyalkyl, acyl, aryl, ether derivatives thereof, or a combination thereof. |