Patent ID: 7125994

Claim:
A compound having formula V wherein E is nitrogen or C—R′; J is sulfur or oxygen; R′, R1, R2, R3, R4 is independently H, halogen, alkyl, nitro, cyano, alkoxy, halogenated alkyl, halogenated alkoxy, phenyl or halogenated phenyl; R5 is H or protected or unprotected side chain of natural or unnatural α-amino acid; R6 is H, alkyl, or aryl; and R7 has a formula: wherein Y 1 , Y 2 , Y 3 , Y 4 , Y 5 , Y 6 , Y 7 , Y 8 , Y 9 , Y 10 is independently selected from hydrogen, halogen, alkyl, and alkoxy; or wherein Z 1 , Z 2 , Z 3 , Z 4 , Z 5 is independently selected from hydrogen, halogen, alkyl, alkoxy, and methylene dioxy of adjacent two residues; or wherein R8 is alkyl or phenyl.