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We used the relatively slow nuclear spin conversion ( NSC ) of NH3 and ND3 in freshly deposited pH2 samples as a tool to assign the sparse vibration - inversion - rotation ( VIR ) spectra of NH3 in the regions of the nu 2 , nu 4 , 2 nu 4 , nu 1 , and nu 3 bands and ND3 in the regions of the nu 2 , nu 4 , nu 1 , and nu 3 fundamentals .
 Chemical: NH3; Chemical: ND3; Chemical: pH2; Chemical: NH3; Chemical: ND3
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: NH3; Chemical: ND3; Chemical: pH2; Chemical: NH3; Chemical: ND3