From d9896d46730a2a54daa8e0736376a0a8ff4a43cd Mon Sep 17 00:00:00 2001
From: Starla Huang <starla_huang@epam.com>
Date: Thu, 4 Jan 2024 16:14:08 +0800
Subject: [PATCH] #3786 fix getting valid attachment point logic for sugar

---
 packages/ketcher-core/src/domain/entities/Sugar.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/ketcher-core/src/domain/entities/Sugar.ts b/packages/ketcher-core/src/domain/entities/Sugar.ts
index e6b65fd78c..c497b70c20 100644
--- a/packages/ketcher-core/src/domain/entities/Sugar.ts
+++ b/packages/ketcher-core/src/domain/entities/Sugar.ts
@@ -74,6 +74,13 @@ export class Sugar extends BaseMonomer {
       return 'R2';
     }
 
+    if (
+      otherMonomer.isAttachmentPointExistAndFree('R2') &&
+      this.isAttachmentPointExistAndFree('R1')
+    ) {
+      return 'R1';
+    }
+
     if (
       !otherMonomer.isAttachmentPointExistAndFree('R1') &&
       this.isAttachmentPointExistAndFree('R1')