主权项 |
1. A composition comprising a layer formed over a core, the core comprising a bioactive agent, the layer comprising a first polymer comprising a repeat unit of Formula (I): wherein,
R2, R4, and R5 are independently chosen from hydrogen, hydrocarbyl, and substituted hydrocarbyl;R6 is chosen from hydrogen, hydrocarbyl, and substituted hydrocarbyl;R7 is optionally present, when present it is chosen from hydrogen, hydrocarbyl, and substituted hydrocarbyl;Z is chosen from sulfur, sulfone, sulfoxide, and selenium;n is an integer ≧1; andm is an integer >1. |