This product is not intended for use as an analytical standard. Please see the link below to review the Certified Reference Material, PHR1053. This material is tested against and traceable to the current USP standard. Testing includes High-Performance Liquid Chromatography (HPLC):
https://www.sigmaaldrich.com/product/sial/phr1054
Please see the following link to review a sample or lot-specific Certificate of Analysis, which includes the Chromatogram:
https://www.sigmaaldrich.com/product/sial/phr1054#product-documentation
