From dad0fddf4aeb376f263cb02c19f30c1891b64c59 Mon Sep 17 00:00:00 2001
From: Dennis Chen <barracks510@gmail.com>
Date: Mon, 6 Jan 2020 12:48:04 -0500
Subject: [PATCH] add an exception to pseudo-elements for sulphonates

---
 src/Drawer.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Drawer.js b/src/Drawer.js
index 2b59f207..7af14d21 100644
--- a/src/Drawer.js
+++ b/src/Drawer.js
@@ -2934,6 +2934,11 @@ class Drawer {
         continue;
       }
 
+      // Ignore sulfonates
+      if (vertex.value.element === 'S') {
+        continue;
+      }
+
       // Ignore also guanidine
       if (vertex.value.element === 'C' && neighbours.length === 3 &&
         neighbours[0].value.element === 'N' && neighbours[1].value.element === 'N' && neighbours[2].value.element === 'N') {