Methyl bromoacetate

Boltorn H40
(98%) was purchased from Perstorp AB, Sweden. Isatin, methyl bromoacetate,
potassium carbonate (K₂CO₃), 1-ethyl-3-(3′-dimethylaminopropyl)
carbodiimide·HCl (EDC·HCl), 4-dimethylaminopyridine (DMAP),
indole-3-acetic acid (2), N-methylindole-3-acetic
acid, and methylindole-3-acetate were purchased from Sigma-Aldrich.
Tetrahydrofuran (THF), N,N-dimethylformamide
(DMF), N,N-dimethylacetamide (DMAc),
1,4-dioxane, chloroform, dichloromethane (DCM), dimethyl sulfoxide
(DMSO), HCl, NaOH, ethanol, methanol, acetone, acetonitrile, ethyl
acetate, diethyl ether, sodium carbonate (Na₂CO₃), NaHCO₃ (ACS, Reag. Ph. Eur.), and NaSO₄ were
purchased from VWR Chemicals. Poly(3-hydroxybutyrate) (PHB) powder
was supplied by BIOMER (Germany), which was washed with 0.001 N aqueous
HCl for 30 min, washed with deionized water, and dried at 50 °C
under vacuum for 2 days before further use. The acid-treated PHB had
a weight-average molar mass (M_w) of 620 000
g mol^–1 and polydispersity index (PDI) of 2.0. PCL
was purchased from Sigma-Aldrich with a weight-average molar mass
(M_w) of 14 000 g mol^–1 and polydispersity index (PDI) of 1.4.

2-(4-Isobutylphenyl) propionic acid (ibuprofen), (98%, Sigma-Aldrich, St. Louis, MO, USA), Resorcinol (99%, Sigma-Aldrich, St. Louis, MO, USA), hydrocinnamaldehyde (90%, Sigma-Aldrich, St. Louis, MO, USA), dodecyl aldehyde (92%, Sigma-Aldrich), hydrochloric acid (36.5–38% Aldrich), ethylendiamine (Sigma-Aldrich, St. Louis, MO, USA), methyl bromoacetate (Sigma-Aldrich, St. Louis, MO, USA), and methyl acrylate (Sigma-Aldrich, St. Louis, MO, USA) were used without additional purification. Triton^™ X-100 solution (Sigma-Aldrich, St. Louis, MO, USA), phosphate-buffered saline pH 7.4 (Sigma-Aldrich, St. Louis, MO, USA), and ethanol (Sigma-Aldrich) were used without additional drying. Tetrahydrofuran THF was dried with Na. N,N-Dimethylformamide (DMF, Sigma-Aldrich, St. Louis, MO, USA), and dimethylsulfoxide (DMSO) (99.8%, Sigma-Aldrich, St. Louis, MO, USA).