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[Only registered and activated users can see links. Click Here To Register...] In compounds of Formula 1, R can be selected from C alkyl and C alkoxy; R can be selected from N CH CH Cl, CH O N CH CH Cl, NH CH OH, CH O C O N CH CH Cl, O C O N CH CH Cl, N CH CH OH CH CH Cl, NH CH CH Cl, and NH CH CH OH each of R, R, and R can be hydrogen; R can be carboxylic acid COOH; R can be hydrogen; each R can be hydrogen; and L can be selected from a bond, CH, CH O, C O NH, C O N CH, CH C O, and CH
