Table 1.

Chemical structure and length of the linkers connecting the 3′- and 5′-ends of NU172, providing the cyclic variants here studied, i.e., cycNU172-EG2, cycNU172-EG3, cycNU172-Ph and cycNU172-Pro, showing their peculiar structural elements.

	Name	Sequence (5′–3′)	Length
	cycNU172-EG2		24 atoms
	cycNU172-EG3		27 atoms
	cycNU172-Ph		24 atoms
	cycNU172-Pro		23 atoms