The molecule is an ammonium ion resulting from the addition of a proton to the free base of SIS3. It is a conjugate acid of a SIS3 free base.
(E)-1-(6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl)-3-(1-methyl-2-phenylpyrrolo[2,3-b]pyridin-3-yl)prop-2-en-1-one;hydron