mol="PTW" Charge="0"
lab="N1"	NH="0" 
lab="P1"	NH="0" 
lab="N2"	NH="0" 
lab="N3"	NH="0" 
lab="C16"	NH="2" 
lab="C17"	NH="2" 
lab="C18"	NH="2" 
lab="C19"	NH="2" 
lab="C20"	NH="2" 
lab="C21"	NH="2" 
