| abstract |
As a substance used as a contrast agent for a method of nuclear magnetic resonance analysis or a method of magnetic resonance imaging, a substance with high selectivity and high sensitivity was demanded. According to the present invention, when a polymer having, in a side chain thereof, a sequence of a 1 H— 13 C— 15 N, 1 H— 15 N— 13 C or 1 H— 13 C— 13 C bond, that is, a structure labeled with stable isotopes of 13 C and 15 N, is used, the abundance of such a sequence in one molecule can be increased, and hence, high selectivity and higher sensitivity can be attained when used as a contrast agent. |