Could a female Viagra be developed? Sprout Pharmaceuticals wants to find out if it can make a so-called pink Viagra and it’s picking up where German pharmaceutical company Boehringer Ingelheim left off. Sprout acquired flibanserin, a compound that Boehringer pursued as a drug to treat hypoactive sexual desire disorder, or HSDD — essentially, diminished sexual desire. Sprout has now raised $5 million to support the Raleigh, North Carolina company’s efforts to commercialize a product to treat this female sexual dysfunction.