Structurally, the reducible compounds are aromatic derivatives or {HEAD ~ quinones} having suitable substituents which promote varying amounts of moiety release at {TAIL ~ physiological pH.} When reduced at about pH 7, the preferred compounds release at least 50% of the available detectable species within 30 minutes 
Structurally , the reducible compounds are aromatic derivatives or { HEAD ~ quinones } having suitable substituents which promote varying amounts of moiety release at { TAIL ~ physiological pH. } When reduced at about pH 7 , the preferred compounds release at least 50 % of the available detectable species within 30 minutes
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