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The synthetic route of CA-Ala, CA-Arg, CA-Ser, and CA-Ser-Urea and morphology of CA-Ser-Urea. (A) The 1-pot condensation reaction synthesis of CA-Ala, CA-Arg, and CA-Ser from CA and amino acids and the solvothermal synthesis of CA-Ser-Urea from CA-Ser and urea. (B) The TEM images of CA-Ser-Urea. The high-resolution TEM image shows visible crystalline lattice fringes with a 0.21-nm interlayer spacing. DMF, N,N-dimethylformamide.
