The β-benzyl-L-aspartate N-carboxyanhydride (BLA-NCA) was purchased from Chuo Kasei Co., Ltd. (Osaka, Japan). The α -methoxy-ω-amino poly(ethylene glycol) (PEG-NH2) (Mw 42k) was obtained from Nippon Oil and Fats (Tokyo, Japan); diethylenetriamine (DET) and 2-[4-(2-hydroxyethyl)-1-piperazinyl]ethanesulfonic acid (HEPES) were purchased from Wako Pure Chemical Industries, Ltd. (Osaka, Japan). DET was used after conventional distillation.
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