English to Greek Science Chemistry; Chem Sci/Eng

Mixture of 5-chloro-2-methyl-4-isothiazolin-3-one [EC no. 247-500-7] and 2-methyl-2H-isothiazol-3-one [EC no. 220-239-6] (3:1).
I have searched this term in the EUR-LEX and I find it as "μείγμα από χλωρο-5-μεθυλο-2- ισοθειαζολιν-4-όνη 3 και μεθυλο-2-ισοθειαζολιν-4-όνη-3 με αναλογία 3: 1".
However, I also find it as Ισοθειαζολόνη again in European Legislation on varnishes.
Can someone expert in chemistry say which of these two versions is correct? Also, could this compound be translated as
Μείγμα 5-χλωρο-2-μεθυλ-4-ισοθειαζολόνη-3 [ΕΚ αριθμ. 247-500-7] και 2-μεθυλ-2υδρο-ισοθειαζολόνη-3 [ΕΚ αριθμ. 220-239-6] (3:1).
I would appreciate your help as I seem to have reached a deadend here...