With no explanation, label each line with "O", "other-medical", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Fentanyl
is
a
synthetic
opioid
in
the
phenylpiperidine
family
,
which
includes
sufentanil
,
alfentanil
,
remifentanil
,
and
carfentanil
.
Fentanyl:other-medical
is:O
a:O
synthetic:O
opioid:O
in:O
the:O
phenylpiperidine:O
family:O
,:O
which:O
includes:O
sufentanil:other-medical
,:O
alfentanil:other-medical
,:O
remifentanil:other-medical
,:O
and:O
carfentanil:other-medical
.:O