Dear Jochen,

the CTFile formats specification can be obtained here 
http://accelrys.com/products/informatics/cheminformatics/ctfile-formats/no-fee.php
 for free.

You may check your SDFile/Molfiles against the spec. The V2000 format uses 
fixed field/line sizes, so it is extremely picky when it comes to tabs, spaces, 
stray characters and wrong/missing line endings. These are the things to look 
for when you encounter parsing problems. Best done with a hex editor. This is 
also the reason why people on this list asked for the file. If you put Molfiles 
in an eMail as text, the correct formatting is almost always lost and you end 
up with garbage.

The Molfile parser of OpenBabel is far from being feature complete, but it has 
no known problems with parsing the connection table so I'd recommend to take a 
look at your file and check it against the spec.

best regards,

Ernst-Georg


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