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good evening my name is james little and i would like to share with you some work that david sparkman and i did on the identification of a white powder we did that work using the nist hybrid search some chemistry and the scifinder program which searches the cas registry initially we did not know that it was a pcp related material but the hybrid search quickly narrowed it down to that class of compounds the nist hybrid search generates a similarity score matching both fragments and neutral losses this greatly extends the scope of the libraries by including nearest neighbor compounds that differ from library compounds by one or more chemical moieties the success requires the presence of similar compounds in the search libraries and the mass differences must be confined to a single region of the molecule and no docHub alteration of fragmentation behavior delta mass is the mass difference between the molecular weights of the query and library compound and reflects the modification of
