Tos-L-Ser-Gly-hydrazide

2-(N-Tos-L-Ser-Gly-L-Ala)hydrazino-4H-1,3,4-thiadiazino<5,6-b>quinoxaline

(S)-3-Hydroxy-N-[(2-imino-thiazolo[4,5-b]quinoxalin-3-ylcarbamoyl)-methyl]-2-(toluene-4-sulfonylamino)-propionamide

[(S)-3-Hydroxy-2-(toluene-4-sulfonylamino)-propionylamino]-acetyl azide

2-(N-Tos-L-Ser-Gly-Gly)hydrazino-4H-1,3,4-thiadiazino<5,6-b>quinoxaline

2-(N-Tos-L-Ser-Gly)-aminobenzothiazole

(S)-3-Hydroxy-N-[N'-(1H-4-thia-1,2,9,10-tetraaza-anthracen-3-yl)-hydrazinocarbonylmethyl]-2-(toluene-4-sulfonylamino)-propionamide

2-(N-Tos-L-Ser-Gly-Gly)-aminobenzothiazole

2-(N-Tos-L-Ser-Gly)-amino-thiazoloquinoxaline

2-(N-Tos-L-Ser-Gly-L-Ala)-aminobenzothiazole