Agent: Patterson Thuente Christensen Pedersen, P.A.20110021621 - Drug for treating circulatory insufficiency: and/or a physiologically acceptable salt thereof as an active ingredient, wherein R1 is an alkyl group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms; and any one of R2, R3, R4 and R5 is a hydroxyl group, an alkoxy group, an alkenyloxy...