24544
Furthermore , PD98059 ( ERK1 / 2 inhibitor ) significantly enhanced 2 - hydroxy - 3 - methylanthraquinone - induced apoptosis in U937 cells , whereas caspase - 3 inhibitor or SB203580 ( p - p38MAPK inhibitor ) , decreased apoptosis in U937 cells .
 Chemical: PD98059; Chemical: 2 - hydroxy - 3 - methylanthraquinone; Chemical: SB203580
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: PD98059; Chemical: 2 - hydroxy - 3 - methylanthraquinone; Chemical: SB203580