What gas can replace ozone as a UV filter in a planet's atmosphere?

Consider a planet with life forms, which are different than those found here on Earth, orbiting a star similar to the Sun. Such life forms don't use oxygen and, therefore, the planet's atmosphere is devoid of it. Since ozone is formed by diatomic oxygen photolysis, there is also not a ozone layer, but life forms need to protect themselves from their star's UVB/UVC radiation, so how would they do it? I mean, It's well known that the Earth's ozone layer prevents UVC radiation and part of the UVB (which are the most dangerous for living beings) from reaching the surface. So is there any other gas, other than ozone, that works as a filter for protection against UVB/UVC radiation?

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What gas can replace ozone as a UV filter in a planet's atmosphere?

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