for c23 h28 n4 o 376 5 obsd lrms apci m 1 m z 378 lrms m z calcd for c21 h21 n5 o 359 4 obsd lrms apci m 1 m z 360 lrms m z calcd for c24 h30 n4 o2 406 5 obsd lrms apci m 1 m z 408 lrms m z calcd for c21 h25 n3 o2 351 4 obsd lrms apci m 1 m z 352 purification method a isolated weight 6 15 mg hplc purity at 220 nm 100 rt 3 87 lrms m z calcd for c24 h32 n4 o 392 5 obsd lrms apci m 1 m z 394 purification method a isolated weight 6 08 mg hplc purity at 220 nm 100 rt 3 41 lrms m z calcd for c23 h30 n4 o 378 5 obsd lrms apci m 1 m z 380 purification method a isolated weight 6 3 mg hplc purity at 220 nm 100 rt 3 63 lrms m z calcd for c24 h24 n4 o 384 5 obsd lrms apci m 1 m z 385 purification method a isolated weight 6 94 mg hplc purity at 220 nm 100 rt 3 43 lrms m z calcd for c27 h29 n5 o 439 6 obsd lrms apci m 1 m z 440 purification method a isolated weight 2 96 mg hplc purity at 220 nm 100 rt 3 52 lrms m z calcd for c21 h23 n3 o2 349 4 obsd lrms apci m 1 m z 350 purification method a isolated weight 3 02 mg hplc purity at 220 nm 100.