A coordinate table can be pasted into the current molecule easily. The table is defined by a bunch of text, separated by "whitespace" (blanks, tabs, enter and return characters). The table can be created with a desk accessory such as the Note Pad, an Editor such as Edit or MacWrite, or any program that is capable of writing text to the Clipboard, such as Multiplan.
A table in the Clipboard is a two dimensional array of four columns by N rows, with each entry separated by whitespace. The first entry of each row is the atomic symbol, and the next three are the X, Y and Z coordinates of the atom. Then more whitespace and another row. This can continue for as many rows as you like.
In Multiplan, set up a 4 x N area with the first column the atomic symbol, the second column the X coordinate, the third column the Y coordinate, and the fourth column the Z coordinate. Then copy the area to the Clipboard, and, without turning the computer off, run Molecular Editor and paste the table into the current Molecule. The connectivity can be entered through the on-screen editing capabilities.
