| abstract |
A novel compound represented by the following formula (1) or a salt thereof [wherein R 1 , R 5 , R 6 , R 7 , and R 8 represent hydrogen atom, a halogen atom, hydroxyl group, an alkyl group, an alkenyl group and the like; X 1 . . . X 2 represents —CH(R 2 )—CH(R 3 )—, —CH(R 2 )—CH(R 3 )—CH(R 4 )—, —C(R 2 )═C(R 3 )—, or —C(R 2 )═C(R 3 )—CH(R 4 )—(R 2 , R 3 , and R 4 represent hydrogen atom, or an alkyl group); A 1 , A 11 , A 2 , and A 21 represent hydrogen atom, or an alkyl group; Y represents —CH(A 3 )-, —CH(A 3 )-C(A 4 )(A 41 )-, —CH(A 3 )-C(A 4 )(A 41 )-C(A 5 )(A 51 )-, or a single bond (A 3 , A 4 , A 41 , A 5 , and A 51 represent hydrogen atom, or an alkyl group), and Z represents hydroxyl group, or —N(A 6 )(A 61 )(A 6 represents hydrogen atom, or an alkyl group, and A 61 represents hydrogen atom, an alkyl group, a substituted alkyl group and the like)], having an action of potently inhibiting phosphorylation of myosin regulatory light chain. |