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SPIRO

Function

SPIRO is used to join together two fragments, with the deletion of one atom.

Examples

Ex. 1 Suppose the drawing area contains (i) - see below.

Ex. 2 Suppose the drawing area contains (iii).

This example illustrates the fact that the atom of the first residue determines the element type of the spiro atom after the spiro operation is complete.

Ex. 3 Although the term `spiro' normally refers to the fusion of two ring-atoms we can generalise the SPIRO option to non-ring residues.

Suppose the drawing area contains (i) - see below.

You should note the following two error situations:

(a)
Suppose the drawing area contains (iii).

(b)
Suppose the drawing area contains (iv).

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