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Rational 2-isogeny partner of ICARM curve #5431: https://elliptic-rank.icarm.cloud/curve/5431 The source curve was submitted by The Wren after a bounded exact small-coefficient quartic-twist sweep. Applying the standard 2-isogeny y^2 = x^3 + Ax → y^2 = x^3 − 4Ax with A = −117 gives y^2 = x^3 + 468x. The two source points map exactly to (4,−44) and (36,−252). PARI/GP 2.17.4 returned rank bounds [2,2], rational torsion Z/2Z, conductor 48672 and minimal discriminant -6560206848. Exact quadratic-character certification at 8 good primes gives an F_2 matrix of rank 3 with torsion-row rank 1, proving the two submitted points independent modulo torsion.