<s>
CNS	O
or	O
Crystallography	B-Application
and	I-Application
NMR	I-Application
system	I-Application
,	O
is	O
a	O
software	O
library	O
for	O
computational	O
structural	O
biology	O
.	O
</s>
<s>
It	O
is	O
an	O
offshoot	O
of	O
X-PLOR	B-Application
and	O
uses	O
much	O
of	O
the	O
same	O
syntax	O
.	O
</s>
