17604
To evaluate the effect of two 1 , 5 - diarylpyrrole - 3 - alkoxyethyl ethers , VA441 and VA428 ( up to 100 mu M ) , respectively , in comparison with two well known COXib , celecoxib and rofecoxib , on HaCaT cell ( keratinocytes ) proliferation and toxicity .
 Chemical: 1 , 5 - diarylpyrrole - 3 - alkoxyethyl ethers; Chemical: VA441; Chemical: VA428; Chemical: celecoxib; Chemical: rofecoxib
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: 1 , 5 - diarylpyrrole - 3 - alkoxyethyl ethers; Chemical: VA441; Chemical: VA428; Chemical: celecoxib; Chemical: rofecoxib