In
the
early
1900's
his
attention
turned
to
magic
bullets
of
a
purely
chemical
nature,
the
chemotherapeutic
agents.
Ehrlich
and
his
associates
had
synthesised
hundreds
of
arsenic-phenol
derivatives.
These
were
tested
by
one
of
his
associates,
Sahachiro
Hata,
against
the
syphilis
organism.
Later
however,
their
attention
focused
on
a
single
chemical,
compound
606.
This
chemical,
after
trials
in
animals
was
made
available
to
physicians
under
the
trade
name
Salvarsan
that
soon
became
the
first
useful
chemotherapeutic
drug.
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