With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
This
method
is
employed
for
the
industrial
synthesis
of
methanethiol
:
This:O
method:O
is:O
employed:O
for:O
the:O
industrial:O
synthesis:O
of:O
methanethiol:other-chemicalthing
::O