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Camptothecin ( CPT ) , a topoisomerase ( Top ) I - targeting drug that stabilizes Top1 - DNA covalent adducts , can induce S - phase - specific cytotoxicity due to the arrest of progressing replication forks .
 Chemical: Camptothecin; Chemical: CPT
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Camptothecin; Chemical: CPT