Online lead generator Adchemy has secured a $19 million third round funding. Mayfield Fund led the round, with Hellman & Friedman and existing investor August Capita participating as well. The Redwood City, CA.-based company has now raised a total of $27 million in funding. Its first round closed at end of 2004 with private investors, while Adchemy’s second round was secured at end of 2005. No word on what this round will be used for, though Adchemy is preparing to release a new product to accompany its existing targeting tool Adchemy Actions later this spring. Release