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We get really annoyed when folks write "N/K" on an MSDS instead of simply stating "Not Known". There is no good reason to abbreviate terms on an MSDS Material Safety Data Sheet! SDS Relevance. Here are some of the more useless abbreviations we've seen on MSDS's. Beware, the folks that use these may have meant something else... SIGMA-ALDRICH MATERIAL SAFETY DATA SHEET Date Printed: 04/21/2008 ... Metaquest A * Nervanaid B acid * Nullapon B acid ... and the MSDS contains all the information ... The information provided in this Safety Data Sheet is correct to the best of our knowledge, information and belief at the Metronidazole Revision Date 08-Feb-2018 date of its publication.