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