Patent ID: 7846971

Claim:
A composition comprising an N-haloamino acid of the formula (I)) A-C(R 1 R oo )R(CH 2 ) n —C(YZ)—X′ (I) or a derivative or pharmaceutical composition thereof; wherein A is HalHN—; Hal is halogen selected from the group consisting of chloro and bromo; R is a carbon-carbon single bond or a divalent cycloalkylene radical with three to six carbon atoms; R 1 is lower alkyl or the group —COOH; R o is lower alkyl; or R 1 and R o together with the carbon atom to which they attach form a (C 3 -C 6 )cycloalkyl ring; n is 0 or an integer from 1 to 13; Y is hydrogen, lower alkyl, —NH 2 , —NHHal or —NHal 2 ; Z is hydrogen or lower alkyl; and X′ is SO 3 H; if R is a divalent cycloalkylene radical n is 0 or an integer up to and including 11, the divalent cycloalkylene radical R or divalent radical —(CH 2 ) n — being optionally substituted with —NHHal or —NHal 2 ; the derivative being a pharmaceutically acceptable salt, ester with lower alkanols, or lower alkanoyl derivative of the —NH 2 group attached to the carbon atom to which the substituent X′ is attached.