When registering a compound, the user can have the possibility to review the matching compounds from the DB and register according to these. In the case of a non-exact match (e.g. tautomer or stereo match), the user can either accept the existing compound or register the compound as a new one.

Steps for registering a new compound:

Preliminary step:

• (1S)-1-phenylethan-1-ol is already registered

1. Draw (1R)-1-phenylethan-1-ol

2. Enter the LnbRef

3. Turn ON the Advanced mode:

   Advanced mode Registration page

4. Click on Find

5. Inspect the Match list. The lot to be registered is a "stereoisomer" (stereo match) of an already registered compound. You can either choose another structure for the lot to be registered or you can just leave the drawn compound.

   Find: Match list	Register: Match list

6. Click on Register. The same Match list appears.

7. Choose Register selected if you want to register your structure as a new compound.

8. Click on Proceed.

The successful registration is summarized in a window, where the allocated Ids are listed: PCN, CN and LN. The new lot will be registered under a new PCN, as a new version and as a first lot within the tree.