26380
The enzyme alkaline phosphatase ( ALP ) is added at different concentrations ( i . e . , 0 , 2 . 5 , and 10 mg . ml ( - 1 ) ) to oligo ( poly ( ethylene glycol ) fumarate ) ( OPF ) hydrogels .
 Chemical: oligo ( poly ( ethylene glycol ) fumarate ); Chemical: OPF
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: oligo ( poly ( ethylene glycol ) fumarate ), OPF 
Answer:
 Chemical: oligo ( poly ( ethylene glycol ) fumarate ); Chemical: OPF