Table 3.

Atom sizes screened in the hard-sphere model of Val and Thr dipeptide mimetics

Atom	Range of radii (Å)	Number of sizes tested
H	0.90–1.10	5
N	1.25–1.60	8
O	1.10–1.55	10
C	1.30–2.00	15
C′	1.30–1.75	10

For each combination of atom sizes (using increments of 0.05 Å), we calculated the interatomic distances of nonbonded atoms to determine steric clashes.