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 ":".
Their
findings
established
that
L-benzylsuccinic
acid
is
bound
at
a
single
locus
at
the
active
site
of
carboxypeptidase
A
.
Their:O
findings:O
established:O
that:O
L-benzylsuccinic:other-chemicalthing
acid:other-chemicalthing
is:O
bound:O
at:O
a:O
single:O
locus:O
at:O
the:O
active:O
site:O
of:O
carboxypeptidase:other-chemicalthing
A:other-chemicalthing
.:O