Export to MOL of Double/Aromtic bond wrapped to R-Group fragment causes exception
- Dominant language
- C++
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- Avg merge
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Description
**Describe the bug**
Export to MOL of Double/Aromtic bond wrapped to R-Group fragment causes exception
**Steps to Reproduce**
1. Load from file: [Double-Aromatic in R-Group.zip](https://github.com/epam/ketcher/files/14097624/Double-Aromatic.in.R-Group.zip)
(unzip first)
2. Try to save it to Molfile V2000
**Actual behavior**
System throws exception: molecule: casting to molecule is invalid
**Expected behavior**
No exception
**Ketcher version** [e.g. v2.4.2].
- Indigo Toolkit Version 1.18.0-rc.5.0-gb21ab5ad5-wasm32-wasm-clang-12.0.0
- Ketcher Version 2.18.0-rc.2 Build at 2024-01-26; 15:56:57
- Chrome Version 120.0.6099.225 (Official Build) (64-bit)
- Win10
- Issue found while testing https://github.com/epam/Indigo/issues/1440
- Issue moved from https://github.com/epam/ketcher/issues/3992
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