Hydrogen pairing is recorded in section 3. This is correct for HELM1, but HELM2 changed the location of hydrogen pairing information. See extract from section 5.3 of the specification below:
In HELM specification 1 and 1.1, the section number 3 was used for the list of hydrogen pairings instead of the polymer groups. The hydrogen pairings are now stored in the connection section (number 2) since hydrogen bonds are now recognized as a special form of connection.
Hydrogen pairing is recorded in section 3. This is correct for HELM1, but HELM2 changed the location of hydrogen pairing information. See extract from section 5.3 of the specification below:
In HELM specification 1 and 1.1, the section number 3 was used for the list of hydrogen pairings instead of the polymer groups. The hydrogen pairings are now stored in the connection section (number 2) since hydrogen bonds are now recognized as a special form of connection.