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 ":".
Taurine
exists
as
a
zwitterion
H3N+CH2CH2SO3−
,
as
verified
by
X-ray
crystallography
.
Taurine:other-chemicalthing
exists:O
as:O
a:O
zwitterion:O
H3N+CH2CH2SO3−:O
,:O
as:O
verified:O
by:O
X-ray:O
crystallography:O
.:O