1H NMR spectra of G5-PPI-PO (c-64) (A), G5-PPI-ACN (a-64) (E), G5-PPI-PO/ACN at molar ratios of 7:3 (B), 5:5 (C), and 3:7 (D). The actual compositions of PO and ACN incorporated into these three PPI conjugates are at molar ratios of 27/73 (B), 40/60 (C), and 60/40 (D), respectively, as determined by integrating two chemical shifts at 1.10 and 2.80 ppm.