Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The eastern provinces of Syria under their unprotected or even insurgent satraps fell into subjection to the Parthians; Persia, Babylonia, Media were for ever severed from the Syrian empire; the new state of the Parthians reached on both sides of the great desert from the Oxus and the Hindoo Coosh to the Tigris and the Arabian desert--once more, like the Persian empire and all the older great states of Asia, a pure continental monarchy, and once more, just like the Persian empire, engaged in perpetual feud on the one side with the peoples of Turan, on the other with the Occidentals.
The Syrian state embraced at the most Mesopotamia in addition to the region of the coast, and disappeared, more in consequence of its internal disorganization than of its diminished size, for ever from the ranks of the great states. If the danger-- which was repeatedly imminent--of a total subjugation of the land by the Parthians was averted, that result must be ascribed not to the resistance of the last Seleucids and still less to the influence of Rome, but rather to the manifold internal disturbances in the Parthian empire itself, and above all to the incursions of the peoples of the Turanian steppes into its eastern provinces.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=110