Indeed, the US had to re-refine its earlier stockpiles of Sarin in order to ensure a long shelf-life for its Sarin. To the layman, Sarin is Sarin. This document described the OPCW’s requirements to safely get rid of various chemicals from the Syrian government’s chemical weapons program. There’s hexamine all over the battlefield and hexamine in the storage vaults of the Syrian government. Knowing how the Chemical Weapons Convention is written and understanding how the OPCW works, one can make several assumptions from this revelation.