Non-reducing polyketide synthase involved in the biosynthesis of a yellow conidial pigment (PubMed:35339702). Probably forms the heptaketide naphthopyrene YWA1 via condensation of acetate units (By similarity). acetyl-CoA + 6 H(+) + 6 malonyl-CoA = 6 CO2 + 7 CoA + H2O + YWA1 Pigment biosynthesis. Polyketide biosynthesis; heptaketide naphthopyrone YWA1 biosynthesis. Expression is limited to the conidia. 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 2 acyl-carrier protein (ACP) domains that serve as the tethers of the growing and completed polyketide via their phosphopantetheinyl arm. The C-terminal region is involved in Claisen-type cyclization of the second ring of naphthopyrone.