PRAVASTATIN IMPURITY A (3R,5R)-3,5-Dihydroxy-7-[(1S,2S,6R,8S,8aR)-6-hydroxy-2-methyl-8-[[(2S)-2-methylbutanoyl]oxy]-1,2,6,7,8,8a-hexahydronaphthalen-1-yl]heptanoic acid Pravastatin impurity A CRS 1-Naphthaleneheptanoic acid, 1,2,6,7,8,8a-hexahydro-β,δ,6-trihydroxy-2-methyl-8-[(2S)-2-methyl-1-oxobutoxy]-, (βR,δR,1S,2S,6R,8S,8aR)- Pravastatin impurity A (Y0000223) Sodium (3R,5R)-3,5-dihydroxy-7-[(1S,2S,6R,8S,8aR)-6- hydroxy-2-methyl-8-[[(2S)-2-methylbutanoyl]oxy]- 1,2,6,7,8,8a-hexahydronaphthalen-1-yl]heptanoic acid