instruction:
In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.
question:
Diels-Alder mediated controlled release from a poly(ethylene glycol) based hydrogel.
answer:
poly(ethylene glycol)

question:
Loss of alpha 2-macroglobulin and epidermal growth factor surface binding induced by phenothiazines and naphthalene sulfonamides.
answer:
phenothiazines

question:
The dynamics of cobalamin utilization in L-1210 mouse leukemia cells: a model of cellular cobalamin metabolism.
answer:
cobalamin