6.6
[]. Anantharaj S, et al. Catalysts and temperature driven melt polycondensation reaction for helical poly (ester‐urethane) s based on natural L‐amino acids. Journal of Polymer Science Part A: Polymer Chemistry, 206, 5(8): 065-077.
H02-H5-H9-H5
P26-P26-P270-P27-P280-P02+P52-P0+P0-P0-P62+P6-P05-P50
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