— function: add-extra-bond-restraint imol chain_id_1 res_no_1 ins_code_1 atom_name_1 alt_conf_1 chain_id_2 res_no_2 ins_code_2 atom_name_2 alt_conf_2 bond_dist esd

Where:

• imol is an integer number
• chain_id_1 is a string
• res_no_1 is an integer number
• ins_code_1 is a string
• atom_name_1 is a string
• alt_conf_1 is a string
• chain_id_2 is a string
• res_no_2 is an integer number
• ins_code_2 is a string
• atom_name_2 is a string
• alt_conf_2 is a string
• bond_dist is a number
• esd is a number

add a user-define bond restraint

this extra restraint is used when the given atoms are selected in refinement or regularization.

Returns: the index of the new restraint.

Returns: -1 when the atoms were not found and no extra bond restraint was stored.