27613
Detailed analysis of the nu 2 bands of NH3 and ND3 indicates that both isotopomers are nearly free rotors ; that the vibrational energy is blue - shifted by 1 - 2 % ; and that the rotational constants and inversion tunneling splitting are 91 - 94 % and 67 - 75 % , respectively , of the gas - phase values .
 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