30120
A structure - activity relationship of the 3 - and 6 - positions of the pyrazolo [ 1 , 5 - a ] pyrimidine scaffold of the known BMP inhibitors dorsomorphin , 1 , LDN - 193189 , 2 , and DMH1 , 3 , led to the identification of a potent and selective compound for ALK2 versus ALK3 .
 Chemical: pyrazolo [ 1 , 5 - a ] pyrimidine; Chemical: dorsomorphin; Chemical: LDN - 193189; Chemical: DMH1
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: pyrazolo [ 1 , 5 - a ] pyrimidine; Chemical: dorsomorphin; Chemical: LDN - 193189; Chemical: DMH1