YS-49 (monohydrate) is a PI3K/Akt (a downstream target of RhoA) activator, to reduce RhoA/PTEN activation in the 3-methylcholanthrene-treated cells. YS-49 inhibits angiotensin II (Ang II) -stimulated proliferation of VSMCs via induction of heme oxygenase (HO) -1. YS-49 is also an isoquinoline compound alkaloid, has a strong positive inotropic action through activation of cardiac β-adrenoceptors[1][2][3].