12375
Dideoxy bicyclic pyrimidine nucleoside analogues ( ddBCNAs ) with d - chirality have previously been described by us to inhibit replication of human cytomegalovirus .
 Chemical: Dideoxy bicyclic pyrimidine nucleoside; Chemical: ddBCNAs
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: Dideoxy bicyclic pyrimidine nucleoside, ddBCNAs 
Answer:
 Chemical: Dideoxy bicyclic pyrimidine nucleoside; Chemical: ddBCNAs