Cat: AP96 Name: Poly(caprolactone)-cholesterol endcap polymer (Mn: 25,000-35,000 Da)
PCL is fairly hydrophobic to begin with but the addition of bulky, hydrophobic cholesterol endcap further discourages water permeation. Dissolves easily in organic solvents such as dichloromethane for processability.
Poly(butylene succinate) PBS is already known to be primarily surface eroding
and has been shown to have biocompatibility (http://beyotime.com/