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Moreover , adding okadaic acid , a PP2A inhibitor , abolished the effects of erlotinib on apoptosis in Hep3B cells ; and forskolin , a PP2A agonist enhanced the effect of erlotinib in resistant HA59T cells .
 Chemical: okadaic acid; Chemical: erlotinib; Chemical: forskolin; Chemical: erlotinib
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: okadaic acid; Chemical: erlotinib; Chemical: forskolin; Chemical: erlotinib