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 ":".
Estrogen
can
be
divided
into
four
classes
:
1
)
Animal
Estrogens
that
includes
estrone
(
E1
)
,
estradiol
(
E2
)
,
and
estriol
(
E3
)
;
2
)
Plant
Estrogens
(
Phytoestrogens
)
;
3
)
Fungi
Estrogens
(
Mycoestrogens
)
and
4
)
Synthetic
Estrogens
(
xenoestrogens
)
.
Estrogen:O
can:O
be:O
divided:O
into:O
four:O
classes:O
::O
1:O
):O
Animal:other-chemicalthing
Estrogens:other-chemicalthing
that:O
includes:O
estrone:other-chemicalthing
(:O
E1:O
):O
,:O
estradiol:other-chemicalthing
(:O
E2:O
):O
,:O
and:O
estriol:other-chemicalthing
(:O
E3:O
):O
;:O
2:O
):O
Plant:other-chemicalthing
Estrogens:other-chemicalthing
(:O
Phytoestrogens:other-chemicalthing
):O
;:O
3:O
):O
Fungi:other-chemicalthing
Estrogens:other-chemicalthing
(:O
Mycoestrogens:other-chemicalthing
):O
and:O
4:O
):O
Synthetic:other-chemicalthing
Estrogens:other-chemicalthing
(:O
xenoestrogens:other-chemicalthing
):O
.:O