{HEAD ~ The order} of {TAIL ~ addition} of the components of this process is not critical to the preparation of the azetidinone product 
{ HEAD ~ The order } of { TAIL ~ addition } of the components of this process is not critical to the preparation of the azetidinone product
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH