GSK is acquiring an experimental medicine from a Cambridge biotech to shore up its drug pipeline and muscle into the promising field of liver therapies.

Under the agreement, GSK will acquire BP Asset IX, a subsidiary of Boston Pharmaceuticals, for up to $2 billion in total cash consideration, including $1.2 billion upfront and up to $800 million in milestone payments.

GSK will buy efimosfermin, a liver disease drug in late-stage trials, for up to $2 billion from U.S. biotechnology firm Boston Pharmaceuticals, the British drugmaker said on Wednesday. Efimosfermin, a monthly subcutaneous injection,