"bis(5'-nucleosyl)-tetraphosphatase (symmetrical)"
"bis(5'-nucleosyl)-tetraphosphatase (symmetrical)"
"diadenosine 5',5'''-P(1),P(4)-tetraphosphate pyrophosphohydrolase"
"diadenosine 5',5'''-p(1),p(4)-tetraphosphate pyrophosphohydrolase"