Non-reducing polyketide synthase; part of the gene cluster that mediates the biosynthesis of neosartoricin, a prenylated anthracenone that exhibits T-cell antiproliferative activity, suggestive of a physiological role as an immunosuppressive agent (PubMed:23758576, PubMed:23368997). The non-reducing polyketide synthase nscA probably synthesizes and cyclizes the decaketide backbone (PubMed:23368997). The hydrolase nscB then mediates the product release through hydrolysis followed by spontaneous decarboxylation (PubMed:23368997). The prenyltransferase nscD catalyzes the addition of the dimethylallyl group to the aromatic C5 (PubMed:23368997). The FAD-dependent monooxygenase nscC is then responsible for the stereospecific hydroxylation at C2 (PubMed:23368997). There is no gene encoding O-acetyltransferase in the nsc gene cluster; thus, the last step of 2-O-acetylation leading to neosartoricin may be catalyzed by an unidentified O-acetyltransferase (PubMed:23368997). Binds 1 phosphopantetheine covalently. Secondary metabolite biosynthesis. Multidomain protein; including a starter unit:ACP transacylase (SAT) that selects the starter unit; a ketosynthase (KS) that catalyzes repeated decarboxylative condensation to elongate the polyketide backbone; a malonyl-CoA:ACP transacylase (MAT) that selects and transfers the extender unit malonyl-CoA; a product template (PT) domain that controls the immediate cyclization regioselectivity of the reactive polyketide backbone; and an acyl-carrier protein (ACP) that serves as the tether of the growing and completed polyketide via its phosphopantetheinyl arm (By similarity).