  We present results of a high resolution study of the filamentary infrared
dark cloud G192.76+00.10 in the S254-S258 OB complex in several molecular
species tracing different physical conditions. These include three
isotopologues of carbon monoxide (CO), ammonia (NH$_3$), carbon monosulfide
(CS). The aim of this work is to study the general structure and kinematics of
the filamentary cloud, its fragmentation and physical parameters. The gas
temperature is derived from the NH$_3 $ $(J,K) = (1,1), (2,2)$ and
$^{12}$CO(2--1) lines and the $^{13}$CO(1--0), $^{13}$CO(2--1) emission is used
to investigate the overall gas distribution and kinematics. Several dense
clumps are identified from the CS(2--1) data. Values of the gas temperature lie
in the ranges $10-35$ K, column density $N(\mathrm{H}_2)$ reaches the value 5.1
10$^{22}$ cm$^{-2}$. The width of the filament is of order 1 pc. The masses of
the dense clumps range from $ \sim 30 $ M$_\odot$ to $ \sim 160 $ M$_\odot$.
They appear to be gravitationally unstable. The molecular emission shows a gas
dynamical coherence along the filament. The velocity pattern may indicate
longitudinal collapse.
