Compound 2 is structurally more rigid as a result of intermolecular covalent bonds, disulfide bonds. These bonds occur between polypeptide chains.
Disulfide bonds are covalent bonds generated by the oxidation of a pair of cysteine amino acids.
Intermolecular disulfide bonds can bind polypeptide chains, thereby stabilizing them.
Intramolecular disulfide bonds can stabilize tertiary molecular structures, while intermolecular disulfide bonds can stabilize quarternary molecular structures.
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