18944
2 - ( Benzothiazol - 2 - yl ) - phenyl - beta - d - galactopyranoside derivatives were synthesized as novel artificial fluorescent pigment dyeing substrates for beta - d - galactosidase .
 Chemical: 2 - ( Benzothiazol - 2 - yl ) - phenyl - beta - d - galactopyranoside
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 2 - ( Benzothiazol - 2 - yl ) - phenyl - beta - d - galactopyranoside