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Dimolybdenum quadruply bonded compounds containing a pendant lactam functional group form self - complementary hydrogen bonded ' dimers of dimers ' in the solid - state and CH ( 2 ) Cl ( 2 ) solutions .
 Chemical: Dimolybdenum; Chemical: lactam; Chemical: hydrogen; Chemical: CH ( 2 ) Cl ( 2 )
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: Dimolybdenum; Chemical: lactam; Chemical: hydrogen; Chemical: CH ( 2 ) Cl ( 2 )