3-isopropylmalate dehydratase large subunit; part of the gene cluster that mediates the biosynthesis of pneumocandins, lipohexapeptides of the echinocandin family that prevent fungal cell wall formation by non-competitive inhibition of beta-1,3-glucan synthase (PubMed:23688303, PubMed:25270390). Possibly secretes antifungal pneumocandins, thus avoiding of intracellular accumulation and ameliorating the toxicity to the producing cells (PubMed:23688303). Belongs to the ABC transporter superfamily. ABCC family. Conjugate transporter (TC 3.A.1.208) subfamily.