It seems like you're interested in chemical manufacturers and the procurement of chemicals with an "OSR EA" grade. However, "OSR EA" is not a standard chemical grade designation that is widely recognized. Chemicals are typically graded based on their purity, quality, and intended use. Common grade designations include ACS (American Chemical Society), USP (United States Pharmacopeia), and technical grade, among others.

osr/emeramide ea grade
IUPAC Name：N1,N3-bis(2-sulfanylethyl)benzene-1,3-dicarboxamide
Synonyms: Fandachem osr ea grade,nbmi ea grade,bdth2 ea grade,mercury chelator,treatment of mercury poisoning.
Manufacturer: Fandachem
cas 351994-94-0
Use: mercury chelator,treatment of mercury poisoning.
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