Fig. 1: Synthesis of ASP-SS-BBR.

A 1H-NMR spectra of BBR and BBRU. B 1H-NMR spectra of HOOC-SS-BBR, ASP, and ASP-SS-BBR. C FTIR spectra of BBRU, DTPA, and HOOC-SS-BBR. D FTIR data for ASP, ASP-SS-BBR, and HOOC-SS-BBR. E DTA of ASP and ASP-SS-BBR.

A 1H-NMR spectra of BBR and BBRU. B 1H-NMR spectra of HOOC-SS-BBR, ASP, and ASP-SS-BBR. C FTIR spectra of BBRU, DTPA, and HOOC-SS-BBR. D FTIR data for ASP, ASP-SS-BBR, and HOOC-SS-BBR. E DTA of ASP and ASP-SS-BBR.