1,3-Diethyl-1,3-Diphenylurea, Pubchem 6828 and 1,3-Dimethyl-1,3-Diphenylurea, Pubchem 11917 mixture; CID-MS data. Reference: "Armed with the Facts: A Method for the Analysis of Smokeless Powders by Ambient Mass Spectrometry" Callum Bonnar, Rachel Popelka-Filcoff, and K. Paul Kirkbride; J. Am. Soc. Mass Spectrom. 2020, 31, 1943−1956. DOI: 10.1021/jasms.0c00193. Excel Add-In default parameters, calculated isotope ratios, 17 seconds analysis time.