2 cyano 2 propyl dithiobenzoate

All
chemicals were used as received, unless
stated otherwise. GEO5MA monomer was kindly donated by GEO Specialty
Chemicals (Hythe, UK). 2-Cyano-2-propyl dithiobenzoate (CPDB, >97%),
benzyl methacrylate (BzMA; 96%), 4,4′-azobis(4-cyanopentanoic
acid) (ACVA; > 98%), sodium periodate (NaIO₄, ≥
99.8%), sodium cyanoborohydride (NaCNBH₃, 95%), L-arginine (≥99.5%), and D₂O were purchased
from Sigma-Aldrich (Gillingham, UK). d₆-Dimethyl sulfoxide
(d₆-DMSO) was purchased from Goss Scientific
Instruments Ltd. (Cheshire, UK). Dimethylformamide (DMF, ≥
99.5%) and ethanol (≥99.5%) were purchased from Fisher Scientific
(Loughborough, UK). Deionized water was obtained from an Elga Medica
DV25 water purification setup.

Glycerol monomethacrylate (GMA; 99.8%) was donated by GEO Specialty Chemicals (Hythe, UK) and was used without further purification. 2-Hydroxypropyl methacrylate (HPMA) was purchased from Alfa Aesar (UK) and was used as received. 4,4′-Azobis(4-cyanopentanoic acid) (ACVA; V-501; 99%), 2,2′-azobisisobutyronitrile (AIBN), 2-cyano-2-propyl dithiobenzoate (CPDB), 4-carboxyphenylboronic acid (CPBA; ≥90%), ethanol (99%, anhydrous grade), methanol, and dichloromethane were purchased from Sigma-Aldrich (UK) and were used as received. Deuterated methanol (CD₃OD) was purchased from Goss Scientific (Nantwich, UK). Buffer solutions were purchased from Thermo Fisher Scientific (Chelmsford, USA). All solvents were HPLC-grade and were purchased from Fisher Scientific (Loughborough, UK).