[chem] fix amide group formula

diff --git a/chem/organic-2.md b/chem/organic-2.md
index c0fadf2c65b10361e146a44c4f290bbc7968d564..10dff38692959937703078a6ab34d4636c29cd9c 100644 (file)
--- a/chem/organic-2.md
+++ b/chem/organic-2.md
@@ -48,7 +48,7 @@ Alkynes: \ce{C_{$n$} H_{$2n-2$}}
   Carboxylic acids & \ce{-COOH} & \chemfig{{\color{blue}R}-C(=[:-30]O)-[:30]O-H}\\\hline
   Ethers & \ce{-O-} & \chemfig{{\color{blue}R}-[:210]O-[:-30]{\color{blue}R}}\\\hline
   Amines & \ce{-NH2} & \chemfig{{\color{blue}R}-N(-[:-30]H)(-[:30]H)}\\\hline
-  Amides & \ce{-CONH2} & \chemfig{{\color{blue}R}-[:30]C(=[:90]O)-[:-30]N(-[:30]H)(-[:-30]H)}\\\hline
+  Amides & \ce{CO-NH} & \chemfig{{\color{blue}R}-[:30]C(=[:90]O)-[:-30]N(-[:30]H)(-[:-30]H)}\\\hline
 \end{tabularx}