abstract |
(57) [Summary] [Problem] To provide a metal-encapsulated fullerol useful as a contrast agent. SOLUTION: In the above formula, x is an integer of 1 or 2, y is an integer of 60 or 70 to 120, and z is an integer of 30 or more. Gadolinium-encapsulated fullerol represented by the following formula) and the use of the fullerol as a contrast agent. |