InChI=1S/C18H21BN4O5/c20-18(21)23-9-16(27-17(25)13-2-1-7-22-8-13)12-3-5-14(6-4-12)19-26-11-15(10-24)28-19/h1-8,15-16,24H,9-11H2,(H4,20,21,23)/t15-,16+/m1/s1