research 1..5
https://www.acsu.buffalo.edu/~jflovell/pubs/Huang_BCC_2016.pdf
15 Jun 2016:
2,3-Nc H); 5.25 (t, 16H, Bu-α-CH2); 2.24 (m, 16H, Bu-β-CH2); 1.62 (m, 16H, Bu-γ-CH2); 1.01 (t, 24H, Bu-CH3). ... 47 (t, 16H, Bu-α-CH2); 3.48 (m, 938H, PEG-CH2); 1.78(m, 16H, Bu-β-CH2); 1.47 (m, 16H, Bu-γ-CH2); 0.88 (t,