… alfa-2a, diesters with polyethylene glycol monomethyl ether. Pegylation occurs at one lysine residue at … Chapter 30). Adoption : 2009 … 4. Pegfilgrastim (INN) (N-(3-hydroxypropyl)methionylcolony-stimulating factor (human), 1-ether with α-methyl-ω-hydroxypoly(oxyethylene)), a form of filgrastim (INN) (a …