Total synthesis, purification, and characterization of human [Phe(p-CH2SO3Na)52, Nle32,53,56, Nal55]-CCK20–58, [Tyr52, Nle32,53,56,Nal55]-CCK-58, and [Phe(p-CH2SO3Na)52, Nle32,53,56, Nal55]-CCK-58 The synthesis of [Phe(p-CH2SO3Na)52, Nle32,53,56 Nal55]-CCK20–58, [Tyr52, Nle32,53,56, Nal55]-CCK-58 and of [Phe(p-CH2SO3Na)52…