<bos>
<cls>
<cls_aa>
<cls_nt>
<cls_sf>
<cls_struct>
<eos>
<mask>
<null_1>
<pad>
<reserved>
<sep>
<unk>
L
A
G
V
S
E
R
T
I
D
P
K
Q
N
F
Y
M
H
W
C
X
B
U
Z
O
.
-
a
c
g
t
n
u
[Branch3]
[C@@H1]
[P]
[#Branch1]
[C]
[Branch2]
[O]
[S]
[Branch1]
[=O]
[#C]
[C@H1]
[=Branch1]
[=N]
[#Branch2]
[N]
[=C]
[Ring1]
[NH1]
[Branch4]
[Ring2]
[=Branch2]
