{HEAD ~ Approximately 1 ml} of {TAIL ~ acetaldehyde}, or any other aldehyde, is added to the mixture 
of
{ HEAD ~ Approximately 1 ml } of { TAIL ~ acetaldehyde } , or any other aldehyde , is added to the mixture
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH