145594-18-9 tert-butyl [6-(2,3,5,6,8,9,11,12-octahydro-7H-1,4,10,13,7-benzotetraoxazacyclopentadecin-7-yl)-6-oxohexyl]carbamate 145611-62-7 tert-butyl [(1S)-3-methyl-1-{[6-(2,3,5,6,8,9,11,12-octahydro-7H-1,4,10,13,7-benzotetraoxazacyclopentadecin-7-yl)-6-oxohexyl]carbamoyl}butyl]carbamate