On the Registration page the user must provide an Id (LnbRef) and a structure. Filling out other fields is not mandatory.

• For a valid LnbRef e.g. A6272 or any other Capital letter followed by numbers can be provided.

• By clicking on the structure area, Marvin 4JS structure editor will be loaded. Structures can be drawn or imported (even by providing a name for source).

Steps for registering a structure:

1. Draw e.g. pyridine

2. Enter the LnbRef

3. Click on the blue Register button located above the structure editor.

The successful registration is summarized in a window, where the allocated Ids are listed: PCN, Parent Compound Number; CN, Compound Number; LN, Lot Number. Since pyridine structure is being registered for the first time, the new lot will be registered under a new PCN (CXN218) and version (CXN218A) and as a first lot of the tree (CXN218-001).

After registering a compound, the user has two options:

• to click on View Details: user can be redirected to the Browse page, where in a tree-like representation the three main entities in the Compound Registration are displayed: parent, version, and lot, or

• to click on OK: the summary window will be closed and a new registration can be started.

If the View Details option is choosen, the user is redirected to the registered lot located in a tree, since the metamizole was already present in the database. In this case a new lot is registered within to an existing parent and version.