21394
Small - size SPIO nanoparticles were chemically bonded with antitumor drug doxorubicin ( DOX ) and biocompatible poly ( ethylene glycol ) ( PEG ) through pH - sensitive acylhydrazone linkages , resulting in the formation of SPIO nanocomposites with magnetic targeting and pH - sensitive properties .
 Chemical: doxorubicin; Chemical: DOX; Chemical: poly ( ethylene glycol ); Chemical: PEG; Chemical: acylhydrazone
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: doxorubicin, DOX, poly ( ethylene glycol ), PEG, acylhydrazone 
Answer:
 Chemical: doxorubicin; Chemical: DOX; Chemical: poly ( ethylene glycol ); Chemical: PEG; Chemical: acylhydrazone