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What is the molecular formula of the molecule identified by 1-[(2S,3R,5R)-3-(acetyloxymethyl)-3-methyl-4,4,7-trioxo-4lambda6-thia-1-azabicyclo[3.2.0]heptane-2-carbonyl]oxyethyl (2S,5R,6R)-3,3-dimethyl-7-oxo-6-[(2-phenylacetyl)amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate ?
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C28H33N3O11S2
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