Can anyone recommend the internal standard (surrogate) of N-Nitroso Thiazolidine-4-carboxylic Acid and 2-hydroxy-2-methyl-3 butenoic acid?

01 January 2015 0 8K Report

For accurate quantitation of N-Nitroso Thiazolidine-4-carboxylic Acid and 2-hydroxy-2-methyl-3 butenoic acid by LC-MS/MS, I need isotope labeled internal standard.

However, I can't find their corresponding stable isotope labeled internal standard.

Does anyone have any suggestion?

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