(R)-2-Hydroxy-2-(4-nitrophenyl)acetic acid is a chiral α-hydroxy acid derivative featuring a 4-nitrophenyl substituent. It is a white to off-white crystalline powder with a molecular formula of C8H7NO5. This compound is characterized by its specific optical rotation, which is a key parameter for verifying its enantiomeric purity as the (R)-enantiomer. This chiral building block is primarily employed in the pharmaceutical industry as a crucial intermediate for the synthesis of enantiomerically pure active pharmaceutical ingredients (APIs). Its structure, containing both a carboxylic acid and a benzylic hydroxyl group, makes it a versatile synthon for constructing more complex molecules, particularly those requiring a defined stereocenter. A prominent application is its use in the synthesis of (R)-(-)-2-Amino-1-(4-nitrophenyl)ethanol, a key intermediate for beta-adrenergic blocking agents (beta-blockers) like (R)-Nifenalol. The compound serves as a valuable precursor in asymmetric synthesis and chiral resolution processes. It is typically handled as a fine chemical under controlled conditions, and standard safety precautions for handling nitroaromatic compounds and organic acids should be observed.