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---
title: Connection table format
---
## Specification
@Note [Reference](https://www.daylight.com/meetings/mug05/Kappler/ctfile.pdf)
The molfile is identified by the extension ``mol`` and the structure data format
is identified by ``sdf``.
Both V2000 and V3000 connection tables can be read.
## Example
Caffeine molecule in mol format:
```text
11262021073D
24 0 0 0 0 999 V2000
1.0732 0.0488 -0.0757 C 0 0 0 0 0 0 0 0 0 0 0 0
2.5137 0.0126 -0.0758 N 0 0 0 0 0 0 0 0 0 0 0 0
3.3520 1.0959 -0.0753 C 0 0 0 0 0 0 0 0 0 0 0 0
4.6190 0.7303 -0.0755 N 0 0 0 0 0 0 0 0 0 0 0 0
4.5791 -0.6314 -0.0753 C 0 0 0 0 0 0 0 0 0 0 0 0
3.3013 -1.1026 -0.0752 C 0 0 0 0 0 0 0 0 0 0 0 0
2.9807 -2.4869 -0.0738 C 0 0 0 0 0 0 0 0 0 0 0 0
1.8253 -2.9004 -0.0758 O 0 0 0 0 0 0 0 0 0 0 0 0
4.1144 -3.3043 -0.0694 N 0 0 0 0 0 0 0 0 0 0 0 0
5.4517 -2.8562 -0.0723 C 0 0 0 0 0 0 0 0 0 0 0 0
6.3893 -3.6597 -0.0723 O 0 0 0 0 0 0 0 0 0 0 0 0
5.6624 -1.4768 -0.0749 N 0 0 0 0 0 0 0 0 0 0 0 0
7.0095 -0.9365 -0.0752 C 0 0 0 0 0 0 0 0 0 0 0 0
3.9206 -4.7409 -0.0616 C 0 0 0 0 0 0 0 0 0 0 0 0
0.7340 1.0879 -0.0750 H 0 0 0 0 0 0 0 0 0 0 0 0
0.7124 -0.4570 0.8233 H 0 0 0 0 0 0 0 0 0 0 0 0
0.7124 -0.4558 -0.9755 H 0 0 0 0 0 0 0 0 0 0 0 0
2.9930 2.1176 -0.0748 H 0 0 0 0 0 0 0 0 0 0 0 0
7.7653 -1.7263 -0.0759 H 0 0 0 0 0 0 0 0 0 0 0 0
7.1486 -0.3218 0.8197 H 0 0 0 0 0 0 0 0 0 0 0 0
7.1480 -0.3208 -0.9695 H 0 0 0 0 0 0 0 0 0 0 0 0
2.8650 -5.0232 -0.0583 H 0 0 0 0 0 0 0 0 0 0 0 0
4.4023 -5.1592 0.8284 H 0 0 0 0 0 0 0 0 0 0 0 0
4.4002 -5.1693 -0.9478 H 0 0 0 0 0 0 0 0 0 0 0 0
M END
```
## Extensions
No extension implemented to the original format.
## Missing Features
The following features are currently not supported:
- Not all modifiers are supported for the connection table
- SDF key-value pair annotations are dropped
- continuation lines in V3000 format are not supported
@Note Feel free to contribute support for missing features
or bring missing features to our attention by opening an issue.
|
