2a-Phenyl-1,2(2a)-Homo[5,6]fullerene-C60-Ih-2a-butanoic Acid Stereoisomer is functionalized Fullerene that is carbon based nanomaterial which is electrophilic in nature. Fullerenes are used in some photovoltaic devices. Also have biomedical applications such as potential MRI and X-ray imaging contrast agents, drugs and genes delivery agents, and photodynamic therapy agents.