<s>
The	O
Chemistry	B-Language
Development	I-Language
Kit	I-Language
(	O
CDK	O
)	O
is	O
computer	O
software	O
,	O
a	O
library	B-Library
in	O
the	O
programming	O
language	O
Java	B-Language
,	O
for	O
chemoinformatics	O
and	O
bioinformatics	O
.	O
</s>
<s>
It	O
is	O
available	O
for	O
Windows	B-Application
,	O
Linux	B-Application
,	O
Unix	B-Application
,	O
and	O
macOS	B-Application
.	O
</s>
<s>
It	O
is	O
free	B-License
and	I-License
open-source	I-License
software	I-License
distributed	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
2.0	O
.	O
</s>
<s>
The	O
CDK	O
was	O
created	O
by	O
Christoph	O
Steinbeck	O
,	O
Egon	O
Willighagen	O
and	O
Dan	O
Gezelter	O
,	O
then	O
developers	O
of	O
Jmol	B-Language
and	O
JChemPaint	B-Application
,	O
to	O
provide	O
a	O
common	O
code	O
base	O
,	O
on	O
27	O
–	O
29	O
September	O
2000	O
at	O
the	O
University	O
of	O
Notre	O
Dame	O
.	O
</s>
<s>
Between	O
2004	O
and	O
2007	O
,	O
CDK	B-Language
News	I-Language
was	O
the	O
project	O
's	O
newsletter	O
of	O
which	O
all	O
articles	O
are	O
available	O
from	O
a	O
public	O
archive	O
.	O
</s>
<s>
Later	O
,	O
unit	O
testing	O
,	O
code	O
quality	O
checking	O
,	O
and	O
Javadoc	B-Language
validation	O
was	O
introduced	O
.	O
</s>
<s>
The	O
library	B-Library
uses	O
JNI-InChI	O
to	O
generate	O
International	O
Chemical	O
Identifiers	O
(	O
InChIs	O
)	O
.	O
</s>
<s>
The	O
CDK	O
is	O
a	O
library	B-Library
,	O
instead	O
of	O
a	O
user	O
program	O
.	O
</s>
<s>
CDK	O
is	O
currently	O
used	O
in	O
several	O
applications	O
,	O
including	O
the	O
programming	O
language	O
R	B-Language
,	O
CDK-Taverna	O
(	O
a	O
Taverna	B-Application
workbench	I-Application
plugin	O
)	O
,	O
Bioclipse	B-Language
,	O
PaDEL	O
,	O
and	O
Cinfony	O
.	O
</s>
<s>
Also	O
,	O
CDK	O
extensions	O
exist	O
for	O
Konstanz	O
Information	O
Miner	O
(	O
KNIME	B-Language
)	O
and	O
for	O
Excel	B-Application
,	O
called	O
LICSS	O
(	O
)	O
.	O
</s>
<s>
In	O
2008	O
,	O
bits	O
of	O
GPL-licensed	O
code	O
were	O
removed	O
from	O
the	O
library	B-Library
.	O
</s>
<s>
While	O
those	O
code	O
bits	O
were	O
independent	O
from	O
the	O
main	O
CDK	O
library	B-Library
,	O
and	O
no	O
copylefting	O
was	O
involved	O
,	O
to	O
reduce	O
confusions	O
among	O
users	O
,	O
the	O
ChemoJava	O
project	O
was	O
instantiated	O
.	O
</s>
