Here is the correctly formatted mol file for SO2 including charges in the 6th field. Select the lines between the dashed lines, do ctrl-c, then ctrl-v in the WebMO Import box. (The first blank line above WebMO must be selected and copied.) This html page includes the <pre> </pre> tags that preserve the correct spacing in the .mol file.
------------------------------------------- WebMO 3 2 0 0 1 V2000 -0.9665 1.2396 -23.901 S 0 1 0 0 0 0 0 0 0 0 0 0 -2.4251 0.2728 -23.901 O 0 -1 0 0 0 0 0 0 0 0 0 0 0.3652 0.5767 -23.901 O 0 0 0 0 0 0 0 0 0 0 0 0 2 1 1 0 1 3 2 0 M END -------------------------------------------