One is enough: The dipeptide Boc-L-Phe-D-Oxd-OBn (Boc=tert-butoxycarbonyl, Phe=phenylalanine, Oxd=4-methyl-5-carboxy oxazolidin-2-one, Bn=benzyl; see picture; gray C, white H, red O, blue N) spontaneously forms uniform fibers consisting of parallel infinite linear chains arising from single intermolecular NH⋅⋅⋅OC hydrogen bonds. This is the absolute borderline case of a parallel β-sheet structure.
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Angelici et al. (2008) studied this question.
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