10433
The majority of the derivatives exhibited better in vitro activity than the existing drug , milrinone , and 6 - ( ( 4 - ( 4 - methoxyphenyl ) piperazin - 1 - yl ) methyl ) tetrazolo [ 5 , 1 - a ] phthalazine .
 Chemical: milrinone; Chemical: 6 - ( ( 4 - ( 4 - methoxyphenyl ) piperazin - 1 - yl ) methyl ) tetrazolo [ 5 , 1 - a ] phthalazine
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: milrinone; Chemical: 6 - ( ( 4 - ( 4 - methoxyphenyl ) piperazin - 1 - yl ) methyl ) tetrazolo [ 5 , 1 - a ] phthalazine