Rock Creek Pharmaceuticals Inc. and two subsidiaries filed for bankruptcy in Delaware last week, owing nearly $3.7 million to lawyers from more than 20 firms, including at least eight from the Am Law 200.

Big firms make up half of Rock Creek’s 20 largest unsecured creditors, including legal giants like Chadbourne & Parke; Crowell & Moring; Foley & Lardner; K&L Gates; McGuireWoods; Morgan, Lewis & Bockius; Skadden, Arps, Slate, Meagher & Flom; and Steptoe & Johnson.