[chem] progress on amino acid structural diagram

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@@ -63,7 +63,7 @@
 
   % amino acid general structure (see Jacaranda p.328)
 
-  \chemfig{\color{red}N(-[:135]H)(-[:225]H)-[:-45]C(-[:-90]\color{yellow}\textit{R})(-H)-[:45]\color{blue}C(=[:90]O)-OH}
+  \chemfig{{\color{red}N}(-[:135,,,,red]{\color{red}H})(-[:225,,,,red]{\color{red}H})-[:-45]C(-[:-90]\color{orange}\textit{R})(-H)-[:45]{\color{blue}C}(=[:90,,,,blue]{\color{blue}O})-[,,,,blue]{\color{blue}OH}}
 
   \subsection*{Zwitterions}