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