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HPLC-TOF MS analysis of cyclocreatine (4) spiked into V1 product. (A) calibration curve for cyclocreatine-spiked V1 sample; (B) accuracy study for cyclocreatine in V1 sample. The recovery amount was analyzed from injection of 1 μg of V1 sample spiked with 5 ng and 10 ng of cyclocreatine.
