Abstract: The invention relates to compounds of formula (I), wherein Z represents a hydrocarbon with 2 to 28 C atoms, wherein Z can also comprise elements N, O, P, S, Si and halogen as heteroatoms, R1 and R2 are identical or different sulfur protecting groups, wherein both S atoms can also form a disulfide bridge and in said case R1 and R2 are not present; protecting group Y1 represents protecting group NH, protecting group NR4, protecting group O, CONH protecting group, protecting group OOC, protecting group S—S, —CH(protecting group O)2 or —CR5(protecting group O)2 or protecting group S; Y2 represents —OH, —NH2, —NHR3, —NR3R4, —COOH, —COCI, —COOCO—R6, —CONH2, —CONHR3, —COOR3, —SO3H, —SO3CI, —SH, —S—SR3, —CHO, —COR3, —C2H3O, halogen, —N3, —NH—NH2, —NCO, —NCS, wherein R3 represents alkyl, heteroalkyl, aryl, cycloalkyl or a protecting group, wherein R3 can be identical or different in groups Y1 and Y2, R4 is s protecting group, wherein R4 can be identical or different in groups Y1 and Y2, and wherein R4 and R3 can be id

Abstract: The invention relates to compounds of formula (I), wherein Z represents a hydrocarbon with 2 to 28 C atoms, wherein Z can also comprise elements N, O, P, S, Si and halogen as heteroatoms, R1 and R2 are identical or different sulfur protecting groups, wherein both S atoms can also form a disulfide bridge and in said case R1 and R2 are not present; protecting group Y1 represents protecting group NH, protecting group NR4, protecting group O.