from these three parent analogs , 1-desamino [ 4-proline,8-lysine ] vp , 1-desamino [ 4-hydroxyproline,8-lysine ] vp , and 1-desamino [ 4-lysine,7-hydroxyproline ] avp , we then prepared the corresponding azido compounds using the epsilon-amino group of lysine as the attachment point .
C0033382
proline
C0020388
hydroxyproline