Each coupling reaction was monitored by means of the
chloranil test (4 ml acetaldehyde in 19.6 ml of DMF and
0.14 g chloranilin DMF 7 ml) [12, 13]. A few grains of resin
were collected into a glass tube with a pipette. One drop
of a solution of acetaldehyde and 1 drop of a solution of
chloranil were added to the resin. After 15 min, the color
of granules was rated. Once the beans of the resin were
green, meaning Fmoc was removed, the process of synthesis
continued.