P4413 falls under a category of products without an assigned retest or expiration date. It is recommended to store the lyophilized product at room temperature. For more information on the expected stability please refer to following document:
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/190/408/product-dating-information-ms.pdf
Following reconstitution in ethanol, aliquot and freeze (-20°C) under an inert gas. Alternately, acidify (pH ≤3) with HCl for long term storage. Stock solutions are stable for up to 3 months at -20°C.
Stability in water or other aqueous solutions have not been determined.



