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Hydrogen bonds with  H..A < r(A) + 2.000 Angstroms  and   110 deg.

D-H           d(D-H)   d(H..A)   
O2-H2B         0.848    1.912   175.64    2.758    O1 [ -x+3/2, y-1/2, -z+1/2 ]
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eqiv $1 -x+3/2, y-1/2, -z+1/2
htab o2 o1_$1
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