Java Molecular Editor: Peter Ertl

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bonds -,=,# rings 3..8, Ph is 1 atoms C,N,O,P,S,F,L,B,I groups t - tert.butyl, ft - CF3, y - nitro, a - COOMe
d - delete Esc - return to the standard state (C, single bond)
molecule may by moved by "dragging" free space and rotated by pressing concurrently also the shift key