<s>
Merck	B-Algorithm
molecular	I-Algorithm
force	I-Algorithm
field	I-Algorithm
(	O
MMFF	O
)	O
is	O
a	O
family	O
of	O
chemistry	O
force	O
fields	O
developed	O
by	O
Merck	O
Research	O
Laboratories	O
.	O
</s>
<s>
The	O
first	O
published	O
force	O
field	O
in	O
the	O
family	O
is	O
MMFF94	B-Algorithm
.	O
</s>
<s>
A	O
set	O
of	O
molecular	O
structures	O
and	O
the	O
corresponding	O
output	O
of	O
Halgren	O
's	O
MMFF94	B-Algorithm
implementation	O
is	O
provided	O
at	O
the	O
Computational	O
Chemistry	O
List	O
for	O
validating	O
other	O
MMFF	O
implementations	O
.	O
</s>
<s>
One	O
variant	O
of	O
MMFF94	B-Algorithm
is	O
MMFF94s	B-Algorithm
,	O
which	O
has	O
different	O
out-of-plane	O
bending	O
and	O
dihedral	O
torsion	O
parameters	O
in	O
order	O
to	O
planarize	O
delocalized	O
trigonal	O
nitrogen	O
atoms	O
,	O
e.g.	O
</s>
<s>
The	O
"	O
s	O
"	O
in	O
MMFF94s	B-Algorithm
stands	O
for	O
"	O
static	O
"	O
,	O
as	O
MMFF94s	B-Algorithm
better	O
reflects	O
time-averaged	O
geometries	O
than	O
MMFF94	B-Algorithm
.	O
</s>
