u2014 co u2014 nh 2 u2014 ch 2 ch 2 cooh ch 3 u2014 ch 2 u2014 ch u2014 formula ho u2014 p ph ch 2 u2014 2 u2014 ch u2014 ph nh u2014 nh u2014 3 u2014 c u2014 nh u2014 ch u2550 n u2014 ch u2550 c u2014 ch 2 u2014 r 5 or r 6 are independently selected from bicyclic fragments of 1 4 3 6 dianhydrohexitols or from the group consisting of alkylene alkenylene alkyloxy oligoethyleneglycol with a mw ranging from 44 da up to 700 da u2014 ch 2 u2014 ch u2014 2 ch 2 chch 2 whereby r 5 and r 6 are non identical r 7 is hydrogen aryl alkyl or a protecting group such as benzyl or a bioactive agent r 8 is independently alkyl or alkenyl r 9 or r 10 are independently selected from c 2 c 12 alkylene or c 2 c 12 alkenylene and r 11 or r 12 are independently selected from h methyl c 2 c 12 alkylene or c 2 c 12 alkenylene application_number US 201614989273 A description the coating of the present invention is based on a polyesteramide comprising an extra block p compared to the above disclosed prior art pea 39 s of formula i this kind of pea blockcopolymers has been found to provide excellent properties in terms of release of a bioactive agent and provide excellent properties in tuning the release of.