Supplier Page from Thermo Fisher Scientific for Calcium oxalate monohydrate, Puratronic:r, 99.9985% (metals basis), (excluding 25ppm max alkali earths)
Ergosterol, 98% from Thermo Fisher Scientific
Estrone, 99+% from Thermo Fisher Scientific
Ethyl 3-pyridylacetate, 99% from Thermo Fisher Scientific
meso-Erythritol, 99% from Thermo Fisher Scientific