Brent crude prices fell almost $1 a barrel on Tuesday, with an Iranian delegation in Beijing this week to push for more oil sales. Oil markets were also pressured as Goldman Sachs (GS.N) said prices needed to remain low for months to achieve a slowdown in U.S. output growth. China is Iran’s largest trade partner and also its largest oil client, having bought roughly half of Iran’s total crude exports since 2012, when sanctions against Iran were tightened. Brent May crude LCOc1 had dropped almost $1 to $57.26 a barrel by 0700 GMT. U.S. May crude CLc1 was down 50 cents at $51.64 a barrel. Goldman said in a research note it expected U.S. crude inventories to top out in April and subsequently draw down at 350,000 barrels per day during May-September, when demand for fuel to power cars and air conditioners is at its greatest.