Export the structure for nucleotides 2-Amino-dA does not work correctly

[AlexeyGirin]

Steps to Reproduce

1. Go to Macromolecules mode - Flex mode
2. Load using paste from clipboard IDT type /5AmdA//i6diPr//i6diPr//i6diPr//3AmdA/ or create manually the following canvas:
3. Save canvas in the IDT format

Actual behavior

Expected behavior Export should be /5AmdA//i6diPr//i6diPr//i6diPr//3AmdA/

Versions: Ketcher Version 2.23.0-rc.2 Build at 2024-07-10; 19:39:22 Indigo Version 1.22.0-rc.2.0-ga21fb5d8f-wasm32-wasm-clang-19.0.0 Chrome Версия 126.0.6478.127 (Официальная сборка), (arm64) MacOs Sonoma 14.5

Issue found for - https://github.com/epam/ketcher/issues/4382

[Zhirnoff]

Tested. Bug fixed.

Desktop:

• OS: Windows 11
• Browser Chrome
• Version 128.0.6613.120 (Official Build) (64-bit)

Ketcher version [Version 2.25.0-rc.1] Indigo version [Version 1.24.0-rc.1]