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 ":".
Prazosin
has
been
established
as
an
effective
and
safe
centrally
active
alpha-1
adrenergic
receptor
antagonist
.
Prazosin:other-medical
has:O
been:O
established:O
as:O
an:O
effective:O
and:O
safe:O
centrally:O
active:O
alpha-1:other-medical
adrenergic:other-medical
receptor:other-medical
antagonist:other-medical
.:O