The product is a white to off-white crystalline solid. Purity by HPLC ≥ 98.0%. Water content ≤ 0.5%. Residue on ignition ≤ 0.1%. Heavy metals < 10 ppm.

No significant impurity peaks detected, conforms to pharmaceutical impurity reference standard grade.

1-(3-Ethyl-4-(hydroxymethyl)phenyl)ethan-1-one is a key pharmaceutical intermediate and impurity reference standard for Siponimod (BAF-312), a selective S1P receptor modulator.

It serves as a critical synthetic building block in the production of Siponimod and its salts/solid forms. Widely applied in impurity profiling, method validation, and quality control for Siponimod drug substance and finished dosage forms. Used in medicinal chemistry research for structure-activity relationship (SAR) studies and synthetic route optimization of S1P modulators. Also utilized as a reference standard in pharmacokinetic and toxicological studies of Siponimod.