InChI=1/C18H20N4O/c19-11-15-7-8-16(12-20)22(15)17(23)13-21-18(9-4-10-18)14-5-2-1-3-6-14/h1-3,5-6,15-16,21H,4,7-10,13H2/p+1/t15-,16+/fC18H21N4O/h21H/q+1 71136A20C9E925D4