Phosphate displays on incorrect side (left) in sequence mode for preset with 5' phosphate

[MarinaKisacik]

Found while testing #9310

Pre-condition:

• A preset with a 5' phosphate is available in the Library

If no, create it:

1. Click Add new button in the presets section
2. In the RNA Builder, select 25mo3r for Sugar, A for base, P for phosphate
3. For phosphate, change the phosphate position to 5' by clicking the phosphate position switcher

4. Change the automatically filled preset name and click Add to Presets button

Steps to Reproduce:

1. Go to Macromolecules mode (clean canvas)
2. Switch to Sequence mode (if not already displayed by default)
3. In the presets section of the Monomer Library, find the preset specified in the precondition and click it

Actual Result:
Phosphate displays on the left side of the sequence for the preset with a 5' phosphate.

Expected Result:
Phosphate displays on the right side of the sequence for all presets.

As per requirement:

8.2. Presets in sequence mode should always be formed with the phosphate on the right (the current behaviour), and position of the phosphate (if present) should be shown as 3'.

Found in Environment:

• Ketcher Version 3.16.0-rc.1 Build at 2026-05-06; 20:39:57
• Indigo Version 1.44.0-rc.3.0-g5ef48a5af-wasm32-wasm-clang-23.0.0
• Chrome Version 148.0.7778.97 (Official Build) (64-bit)
• Win11

[umutzd-alt]

This might have been fixed, as when I check now, it shows it on the right side

@AlexeyGirin do we know if someone was working on this task?

[MarinaKisacik]

Hi @umutzd-alt,

What kind of preset are you checking? With phosphate on the left?