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ORTEP diagram of (S,S,R)-3a (left, most of the hydrogen atoms were omitted except the one on the chiral center connected to boron) and the H-bonds between the molecules (right). Selected bond lengths [Å] and angle [o]: P1–O1 1.505, P1–N1 1.613, N1–H1, 0.957, B1–O2 1.368, the H-bond O1···H2 1.990; the angle of H bond N1–H1···O4 142.79.
