Simpson Thacher & Bartlett is acting opposite Skadden Arps Slate Meagher & Flom on what has been dubbed the biggest acquisition by a Chinese internet company in history – Alibaba’s buyout of mobile browser UCWeb.

The Hangzhou-based e-commerce giant, which already owns 66% of UCWeb, is taking steps to acquire the rest of the company as it seeks to boost its profile in the mobile web market, where rival Tencent is currently a leader due to the success of its messaging services WeChat and QQ.