New endohedral fullerene C-70 encapsulating one and two H-2 molecules) has been synthesized by organic reactions, the so-called "molecular surgery" method, and the first organic derivatization of H-2@C-70 and (H-2)(2)@C-70 has been conducted. Although the interaction between inner H-2 and outer C-70 is rather weak, (H-2)(2)@C-70 exhibits smaller equilibrium constants in the Diels-Alder reaction with 9,10-dimethylanthracene than those of H-2@C-70.