Left, Mark Rothko, Sienna, Orange and Black on Dark Brown, 1962; Right, Andy Warhol, Suicide (Purple Jumping Man), 1965. Courtesy of the Tehran Museum of Contemporary Art. Warhol, Pollock, Rothko—you name it. A legendary exhibition draws from a collection worth $3 billion. Plus: the former empress of Iran reacts to the news. It’s a collection that includes artworks by Andy Warhol, Claude Monet, Roy Lichtenstein, Jackson Pollock, Alberto Giacometti, Willem de Kooning, René Magritte, and many others.…