| abstract |
(57) [Problem] To provide a novel isocarbacycline derivative useful as a probe of a prostacyclin receptor in the central nervous system and a 3 H, 11 C, 14 C labeled compound thereof. SOLUTION: The following formula: (R 1 represents a hydrogen atom, an alkyl group or one equivalent cation, R 2 represents an alkylene atom, and R 3 represents a hydrogen atom or a methyl group). |