		      CH3  	          
	     O	     /	               	  
	      \	    /     / \	       	  
   H3C---N     \___O     /   \            
	 |     /        |     |	          
	 |___ /	  O     |     |		  
        /|   \   / \   / \   /	          
       / |    \ /   \ /   \ /	          
       \ |    /	    |	    		  
        \|___/	    |	    		  
		    O	   	